CD RADIO INC
SC 13D, 1998-11-12
RADIO BROADCASTING STATIONS
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                        SECURITIES AND EXCHANGE COMMISSION
                              Washington, D.C. 20549

                                  Schedule 13D**

                    Under the Securities Exchange Act of 1934
                                (Amendment No. )*

                                  CD Radio Inc.
                                 (Name of Issuer)

                          Common Stock, par value $.001
                          (Title of Class of Securities)

                                    125127100
                                  (Cusip Number)

                                 W. Robert Cotham
                           201 Main Street, Suite 2600
                             Fort Worth, Texas  76102
                                 (817)390-8400  
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                 November 2, 1998
             (Date of Event which Requires Filing of this Statement)

     If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box [ ].

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

**The total number of shares reported herein is 5,127,900 shares, which
constitutes approximately 22.2% of the total number of shares outstanding.  All
ownership percentages set forth herein assume that there are 23,145,104 shares
outstanding.<PAGE>
<PAGE>

1.       Name of Reporting Person:

         Prime 66 Partners, L.P.

2.       Check the Appropriate Box if a Member of a Group:           
                                                            (a) /   /

                                                            (b) / X /

3.       SEC Use Only


4.       Source of Funds: OO-Partnership Contributions

5.       Check box if Disclosure of Legal Proceedings is Required Pursuant to
         Items 2(d) or 2(e):               

                                                                /   /
6.       Citizenship or Place of Organization: Texas


              7.   Sole Voting Power: 5,061,700
Number of                                                           
Shares
Beneficially  8.   Shared Voting Power: -0- 
Owned By                                                       
Each
Reporting          9.   Sole Dispositive Power: 5,061,700
Person                                                         
With
              10.  Shared Dispositive Power: -0- 

11.      Aggregate Amount Beneficially Owned by Each Reporting Person:

         5,061,700 

12.      Check Box if the Aggregate Amount in Row (11) Excludes Certain
         Shares:                                           
                                                                /   /

13.      Percent of Class Represented by Amount in Row (11): 21.9%  

14.      Type of Reporting Person: PN

<PAGE>
<PAGE>

1.       Name of Reporting Person:

         Composite 66, L.P.

2.       Check the Appropriate Box if a Member of a Group:           
                                                            (a) /   /

                                                            (b) / X /

3.       SEC Use Only


4.       Source of Funds: OO-Partnership Contributions

5.       Check box if Disclosure of Legal Proceedings is Required Pursuant to
         Items 2(d) or 2(e):               

                                                                /   /
6.       Citizenship or Place of Organization: Texas


              7.   Sole Voting Power: -0- 
Number of                                                           
Shares
Beneficially  8.   Shared Voting Power: -0-
Owned By                                                       
Each
Reporting          9.   Sole Dispositive Power: -0- 
Person                                                         
With
              10.  Shared Dispositive Power: -0-

11.      Aggregate Amount Beneficially Owned by Each Reporting Person:

         66,200 (1)

12.      Check Box if the Aggregate Amount in Row (11) Excludes Certain
         Shares:                                           
                                                                /   /

13.      Percent of Class Represented by Amount in Row (11): 0.3%  

14.      Type of Reporting Person: PN


- ----------
(1) Pursuant to Rule 13d-3(d)(1)(i)(C), such shares may be deemed to be
beneficially owned pursuant to the power to terminate a managed account.<PAGE>
<PAGE>
ITEM 1.  SECURITY AND ISSUER.

         This statement relates to shares of Common Stock, par value $.001 per
share (the "Stock"), of CD Radio Inc. (the "Issuer").  The principal executive
offices of the Issuer are located at 2175 K Street, N.W., Sixth Floor,
Washington, D.C. 20037.

ITEM 2.  IDENTITY AND BACKGROUND.

         (a)  Pursuant to Rule 13d-1(a) of Regulation 13D-G of the General
Rules and Regulations under the Securities Exchange Act of 1934, as amended (the
"Act"), this Schedule 13D Statement is hereby filed by Prime 66 Partners, L.P.,
a Texas limited partnership ("Prime") and Composite 66, L.P., a Texas limited
partnership ("Composite") (each a "Reporting Person" and collectively, the
"Reporting Persons").  Additionally, pursuant to Instruction C to Schedule 13D,
information is included herein with respect to the following persons
(collectively, the "Controlling Persons"):  P-66 Genpar, L.P., a Texas limited
partnership ("Genpar"), Carmel Land & Cattle Co., a Texas corporation
("Carmel"), William P. Hallman, Jr. ("Hallman"), P-66, Inc., a Texas corporation
("P-66"), The Sid R. Bass Management Trust, a revocable trust existing under the
laws of the state of Texas ("Trust"), and Sid R. Bass ("SRB").  The Reporting
Persons and the Controlling Persons are sometimes hereinafter collectively
referred to as the "Item 2 Persons."

         (b)-(c)

         Reporting Persons

         Prime is a Texas limited partnership, the principal business of which
is the purchase, sale, exchange, acquisition and holding of investment
securities.  The principal address of the Reporting Person, which also serves
as its principal office, is 201 Main Street, Suite 3200, Fort Worth, Texas
76102.  
         
         Composite is a Texas limited partnership, the principal business of
which is the purchase, sale, exchange, acquisition and holding of investment
securities.  The principal address of the Reporting Person, which also serves
as its principal office, is 201 Main Street, Suite 3200, Fort Worth, Texas
76102.  
         
         Controlling Persons

         Pursuant to Instruction C to Schedule 13D of the Act, information with
respect to the Controlling Persons is set forth below. 

         Genpar is a Texas limited partnership, the principal business of which
is serving as one of two general partners of each of the Reporting Persons and
activities related thereto.  The principal address of Genpar, which also serves
as its principal office, is 201 Main Street, Suite 3200, Fort Worth, Texas
76102.   
         
         Carmel is a Texas corporation, the principal business of which is
investment in securities and real estate and activities related thereto.  The
principal address of Carmel, which also serves as its principal office, is 201
Main Street, Suite 3200, Fort Worth, Texas 76102.  Hallman is the sole
shareholder of Carmel; Hallman and Donald J. McNamara ("McNamara") are its
directors; and Hallman (Vice-President) and McNamara (President) are its
principal officers.   

         Hallman's principal occupation or employment is serving as a
shareholder and director of the law firm of Kelly, Hart & Hallman, P.C. 
Hallman's business address is 201 Main Street, Suite 2500, Fort Worth, Texas
76102.

         The principal occupation of McNamara is serving as the Chairman of The
Hampstead Group. McNamara's business address is 4200 Chase Texas Tower West,
2200 Ross Avenue, Dallas, Texas 75201.

         The Hampstead Group is a real estate investment firm, the principal
business of which is real estate investment.  The principal address of The
Hampstead Group, which also serves as its principal office, is 4200 Chase Texas
Tower West, 2200 Ross Avenue, Dallas, Texas 75201.

         P-66 is a Texas corporation, the principal business of which is
serving as general partner of each of the Reporting Persons and activities
related thereto.  The principal address of P-66, which also serves as its
principal office, is 201 Main Street, Suite 3200, Fort Worth, Texas 76102. 
Trust is the sole shareholder of P-66; SRB is its sole director; and SRB
(President), Hallman (Vice-President and Assistant Secretary), and W. Robert
Cotham ("Cotham") (Vice-President and Secretary) are its principal officers.
         
         Trust is a revocable trust existing under the laws of the state of
Texas, the grantor of which is SRB.  The address of Trust is 201 Main Street,
Suite 2700, Fort Worth, Texas 76102.  The Trustees of the Trust are SRB and two
members of his family.  

         SRB's principal occupation or employment is serving as the President
of Sid R. Bass, Inc. ("SRB, Inc.").  SRB's business address is 201 Main Street,
Suite 2700, Fort Worth, Texas 76102.

         SRB, Inc. is a Texas corporation, the principal businesses of which
are the ownership and operation of oil and gas properties (through Bass
Enterprises Production Co. ["BEPCO"]), the ownership and operation of gas
processing plants and carbon black plants (through various partnerships),
farming and ranching, investing in marketable securities and real estate
investment and development.  The principal address of SRB, Inc., which also
serves as its principal office, is 201 Main Street, Suite 2700, Fort Worth,
Texas 76102. 

         The principal occupation or employment of Cotham is serving as the
Vice-President/Controller of BEPCO.  Cotham's business address is 201 Main
Street, Suite 2600, Fort Worth, Texas 76102. 

         BEPCO is a Texas corporation, the principal business of which is oil
exploration and drilling and producing hydrocarbons.  The principal address of
BEPCO, which also serves as its principal office, is 201 Main Street, Suite
2700, Fort Worth, Texas 76102.
              
ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.
         
         The source and amount of the funds used or to be used by the Reporting
Person to purchase the shares is set forth below.  

REPORTING PERSON             SOURCE OF FUNDS               AMOUNT OF FUNDS

     Prime              Other (1)                     $ 101,240,236.04

     Composite               Other (1)                     $   1,746,514.41
                                   
(1)      Contributions from partners.

ITEM 4.  PURPOSE OF TRANSACTION.
         
         The Reporting Persons acquired and continue to hold the shares of the
Stock reported herein for investment purposes.  Depending on market conditions
and other factors that the Reporting Persons may deem material to their
investment decision, the Reporting Persons may purchase additional Stock in the
open market or in private transactions.  Depending on these same factors, the
Reporting Persons may sell all or a portion of the Stock on the open market or
in private transactions.  In addition, 5,000,000 shares of the Stock are subject
to the Purchase Agreement described in Item 6 below.
           
         Except as set forth in this Item 4, the Reporting Persons have no
present plans or proposals that relate to or that would result in any of the
actions specified in clauses (a) through (j) of Item 4 of Schedule 13D of the
Act.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

         (a)

         Reporting Persons

         Prime

         Pursuant to Rule 13d-3(a), Prime is the beneficial owner of 5,061,700
shares of the Stock, which constitutes approximately 21.9% of the outstanding
shares of Stock.
         
         Composite
         
         Pursuant to Rule 13d-3(d)(1)(i)(C), Composite may be deemed to be the
beneficial owner of 66,200 shares of the Stock, which constitutes approximately
0.3% of the outstanding shares of Stock.

         Controlling Persons

         Each of (1) Genpar, as one of two general partners of each of the
Reporting Persons, and (2) Carmel, as the sole general partner of Genpar, may,
pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
5,127,900 shares of the Stock, which constitutes approximately 22.2% of the
outstanding shares of Stock.

         In his capacity as the sole shareholder of Carmel, Hallman may,
pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
5,127,900 shares of the Stock, which constitutes approximately 22.2% of the
outstanding shares of Stock.

         In its capacity as one of two general partners of each of the
Reporting Persons, P-66 may, pursuant to Rule 13d-3 of the Act, be deemed to be
the beneficial owner of 5,127,900 shares of the Stock, which constitutes
approximately 22.2% of the  outstanding shares of Stock.
         
         In its capacity as the sole shareholder of P-66, Trust may, pursuant
to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 5,127,900
shares of the Stock, which constitutes approximately 22.2% of the outstanding
shares of Stock. 

         In his capacity as a Trustee of Trust, SRB may, pursuant to Rule 13d-3
of the Act, be deemed to be the beneficial owner of 5,127,900 shares of the
Stock, which constitutes approximately 22.2% of the outstanding shares of Stock.

         To the best of the knowledge of the Reporting Persons, other than as
set forth above, none of the persons named in Item 2 herein is the beneficial
owner of any shares of the Stock.

         (b)

         Reporting Persons

         Prime

         Acting through its two general partners, Genpar and P-66, Prime has
the sole power to vote or to direct the vote and to dispose or to direct the
disposition of 5,061,700 shares of the Stock.

         Composite

         Composite has no power to vote or to direct the vote or to dispose or
direct the disposition of any shares of the Stock.
              
         Controlling Persons
         
         Acting through its general partner, Carmel, and in its capacity as 
one of two general partners of Prime, Genpar has the shared power to vote or to
direct the vote and to dispose or to direct the disposition of 5,061,700 shares
of the Stock.  
         
         Acting through its sole shareholder, Hallman, and in its capacity as
the general partner of Genpar, Carmel has the shared power to vote or to direct
the vote and to dispose or direct the disposition of 5,061,700 shares of the
Stock.

         In his capacity as the sole shareholder of Carmel, Hallman has the
shared power to vote or to direct the vote and to dispose or to direct the
disposition of 5,061,700 shares of the Stock.

         In its capacity as one of two general partners of Prime, P-66 has the
shared power to vote or to direct the vote and to dispose or to direct the
disposition of 5,061,700 shares of the Stock.

         In its capacity as the sole shareholder of P-66, Trust has the shared
power to vote or to direct the vote and to dispose or direct the disposition of
5,061,700 shares of the Stock. 

         In his capacity as a Trustee of Trust, SRB has the shared power to
vote or to direct the vote and to dispose or direct the disposition of 5,061,700
shares of the Stock. 

         (c) 

         During the last 60 days, Prime has purchased shares of the Stock in
open market transactions on the Nasdaq National Market as follows:

                             NUMBER OF           PRICE PER
         DATE                SHARES              SHARE

         09/11/98            3,000               $16.00
         09/11/98            4,200               $16.02

         In addition, on November 2, 1998, Prime purchased 5,000,000 shares of
stock in a private transaction at a price per share of $20.00.

         (d)

         Not applicable.

         (e)

         Not applicable.

ITEM 6.  CONTRACTS, ARRANGEMENTS, UNDERSTANDING OR RELATIONSHIPS WITH RESPECT
         TO SECURITIES OF THE ISSUER.

         On November 2, 1998, the Issuer issued to Prime a total of 5,000,000
shares of Stock for an aggregate purchase price of $100,000,000 pursuant to a
Stock Purchase Agreement dated October 8, 1998 (the "Purchase Agreement").  The
description of the Purchase Agreement that follows does not purport to be
complete and is qualified in its entirety by reference to the Purchase
Agreement, a copy of which is attached hereto as Exhibit 99.2.   

         Under the Purchase Agreement, after October 1, 2000, Prime is entitled
to two demand registrations under the Securities Act of 1933, as amended (the
"Securities Act") of its purchased shares of Stock.  Such demand rights are
subject to a "blackout" period (not to exceed 90 days) if, among other things,
the Board of Directors of the Issuer determines in good faith that it would be
seriously detrimental to the Issuer and its stockholders to file a registration
statement at the requested time.  In addition, after October 1, 2000, Prime will
have certain piggyback registration rights granting it the right to include its
purchased shares of Stock if the Issuer files a registration statement under the
Securities Act.  The Purchase Agreement also provides that, at any time prior
to the earlier of (i) October 1, 2001 and (ii) the date that Prime ceases to own
beneficially 10% or more of the Stock,  Prime will not offer, sell or transfer
the Stock acquired pursuant to the Purchase Agreement for a period of up to 180
days if requested not to do so by the Issuer's underwriters in connection with
a public offering.

         Except as set forth herein or in the Exhibits filed herewith, there
are no contracts, arrangements, understandings or relationships with respect to
shares of the Stock owned by the Item 2 Persons.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

         Exhibit 99.1 -- Agreement and Power of Attorney authorizing W. Robert
Cotham, William O. Reimann IV, Mark L. Hart, Jr., Thomas W. Briggs, and Calvin
M. Jackson to act on behalf of Composite 66, L.P. and Prime 66 Partners, L.P.
filed herewith.

         Exhibit 99.2 -- Stock Purchase Agreement by and among CD Radio Inc.
and Prime 66 Partners, L.P. dated as of October 8, 1998, filed herewith.<PAGE>
<PAGE>

         After reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement is true, complete and
correct.

         DATED:     November 12, 1998



                        PRIME 66 PARTNERS, L.P.

                        
                        
                        By:  P-66, INC.,
                             general partner

                             By: /s/ William P. Hallman, Jr.                 
                                William P. Hallman, Jr., Vice-President 
                           

                        By:  P-66 GENPAR, L.P.,
                             general partner

                             By:  Carmel Land & Cattle Co.,      
                                  general partner

                                  
                                  By: /s/ William P. Hallman, Jr.           
                                     William P. Hallman, Jr., Vice-President 



                        COMPOSITE 66, L.P.

                        
                        
                        By:  P-66, INC.,
                             general partner

                             By: /s/ William P. Hallman, Jr.                 
                                William P. Hallman, Jr., Vice-President 
                           

                        By:  P-66 GENPAR, L.P.,
                             general partner

                             By:  Carmel Land & Cattle Co.,      
                                  general partner

                                  
                                  By: /s/ William P. Hallman, Jr.           
                                     William P. Hallman, Jr., Vice-President
                                         
<PAGE>
<PAGE>

                                  EXHIBIT INDEX


EXHIBIT            DESCRIPTION

99.1          Joint Filing Agreement and Power of Attorney authorizing W.
              Robert Cotham, William O. Reimann IV, Mark L. Hart, Jr., Thomas
              W. Briggs, and Calvin M. Jackson to act on behalf of Composite
              66, L.P. and Prime 66 Partners, L.P. filed herewith.

99.2          Stock Purchase Agreement by and among CD Radio Inc. and Prime 66
              Partners, L.P. dated October 8, 1998.

                                   Exhibit 99.1

         1.  Joint Filing.  Pursuant to Rule 13d-1(k)(1)(iii) of Regulation
13D-G of the General Rules and Regulations of the Securities and Exchange
Commission under the Securities Exchange Act of 1934, as amended, the
undersigned agrees that the statement to which this Exhibit is attached is filed
on behalf of each of them in the capacities set forth below.

         2.  Power of Attorney.  Know all persons by these presents that each
person whose signature appears below constitutes and appoints W. Robert Cotham,
William O. Reimann IV, Mark L. Hart, Jr., Thomas W. Briggs, and Calvin M.
Jackson, and each of them, as his true and lawful attorneys-in-fact and agents
with full power of substitution and resubstitution, for such person and in such
person's name, place and stead, in any and all capacities, to sign any and all
reports filed pursuant to Sections 13(d), 13(g) or 16(a) of the Securities
Exchange Act of 1934, filed on behalf of each of them with respect to their
beneficial ownership of CD Radio Inc., and any and all amendments thereto, and
to file the same, with all exhibits thereto and all documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing requisite and necessary to be done in
and about the premises, as fully to all intents and purposes as such person
might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents or any of them, or such person or their substitute
or substitutes, may lawfully do or cause to be done by virtue hereof.


         DATED:    November 12, 1998



                        PRIME 66 PARTNERS, L.P.

                        
                        
                        By:  P-66, INC.,
                             general partner

                             By: /s/ William P. Hallman, Jr.                 
                                William P. Hallman, Jr., Vice-President 
                           

                        By:  P-66 GENPAR, L.P.,
                             general partner

                             By:  Carmel Land & Cattle Co.,      
                                  general partner

                                  
                                  By: /s/ William P. Hallman, Jr.           
                                     William P. Hallman, Jr., Vice-President 



                        COMPOSITE 66, L.P.

                        
                        
                        By:  P-66, INC.,
                             general partner

                             By: /s/ William P. Hallman, Jr.                
                                William P. Hallman, Jr., Vice-President 
                           

                        By:  P-66 GENPAR, L.P.,
                             general partner

                             By:  Carmel Land & Cattle Co.,      
                                  general partner

                                  
                                  By: /s/ William P. Hallman, Jr.           
                                     William P. Hallman, Jr., Vice-President
                                         



                                   Exhibit 99.2

                         TABLE OF CONTENTS
   
   
                                                                  Page
   
ARTICLE 1 DEFINITIONS. . . . . . . . . . . . . . . . . . . .
     1.1  Definitions. . 
ARTICLE 2 PURCHASE AND SALE OF SECURITIES. . . . . . . . . .
     2.1  Purchase and Sale of Securities. . . . . . . . . .
     2.2  Closing. . . . . . . . . . . . . . . . . . . . . .
ARTICLE 3 REPRESENTATIONS AND WARRANTIES OF THE COMPANY. . .
     3.1  Corporate Existence and Power. . . . . . . . . . .
     3.2  Subsidiaries . . . . . . . . . . . . . . . . . . .
     3.3  Corporate Authorization; No Contravention. . . . .
     3.4  Governmental Authorization; Third Party Consents .
     3.5  Binding Effect . . . . . . . . . . . . . . . . . .
     3.6  Capitalization of the Company. . . . . . . . . . .
     3.7  SEC Filings; Financial Statements. . . . . . . . .
     3.8  Absence of Certain Developments. . . . . . . . . .
     3.9  Compliance with Laws . . . . . . . . . . . . . . .
     3.10 Licenses . . . . . . . . . . . . . . . . . . . . .
     3.11 Litigation . . . . . . . . . . . . . . . . . . . .
     3.12 Intellectual Property. . . . . . . . . . . . . . .
     3.13 Private Offering . . . . . . . . . . . . . . . . .
   
ARTICLE 4 REPRESENTATIONS AND WARRANTIES OF THE PURCHASER. .
     4.1  Existence and Power. . . . . . . . . . . . . . . .
     4.2  Authorization; No Contravention. . . . . . . . . .
     4.3  Governmental Authorization; Third Party Consents .
     4.4  Binding Effect . . . . . . . . . . . . . . . . . .
     4.5  Purchase for Own Account . . . . . . . . . . . . .
     4.6  Sufficient Funds . . . . . . . . . . . . . . . . .
   
ARTICLE 5 COVENANTS. . . . . . . . . . . . . . . . . . . . .
     5.1  Conduct of Business. . . . . . . . . . . . . . . .
     5.2  Indemnification of Brokerage . . . . . . . . . . .
     5.3  Rule 144 . . . . . . . . . . . . . . . . . . . . .
     5.4  HSR Approval . . . . . . . . . . . . . . . . . . .
     5.5  Stockholder Approval . . . . . . . . . . . . . . .
     5.6  Amendment to Rights Agreement and Board Approval .
   
ARTICLE 6 LOCK-UP AGREEMENTS . . . . . . . . . . . . . . . .
   
ARTICLE 7 CONDITIONS PRECEDENT TO THE OBLIGATION OF THE
             PURCHASER TO CLOSE. . . . . . . . . . . . . . .
     7.1  Representations and Covenants. . . . . . . . . . .
     7.2  Consents and Approvals . . . . . . . . . . . . . .
     7.3  Opinion of Counsel to the Company. . . . . . . . .
     7.4  HSR Act. . . . . . . . . . . . . . . . . . . . . .
     7.5  No Claims. . . . . . . . . . . . . . . . . . . . .
   
ARTICLE 8 CONDITIONS PRECEDENT TO THE OBLIGATION OF THE
             COMPANY TO CLOSE. . . . . . . . . . . . . . . .
     8.1  Representations and Covenants. . . . . . . . . . .
     8.2  Consents and Approvals . . . . . . . . . . . . . .
     8.3  HSR Act. . . . . . . . . . . . . . . . . . . . . .
     8.4  No Claims. . . . . . . . . . . . . . . . . . . . .
   
ARTICLE 9 REGISTRATION RIGHTS. . . . . . . . . . . . . . . .
     9.1  Requested Registration . . . . . . . . . . . . . .
     9.2  Company Registration . . . . . . . . . . . . . . .
     9.3  Transferability. . . . . . . . . . . . . . . . . .
     9.4  Expenses of Registration . . . . . . . . . . . . .
     9.5  Registration Procedures. . . . . . . . . . . . . .
     9.6  Indemnification. . . . . . . . . . . . . . . . . .
   
ARTICLE 10TERMINATION OF AGREEMENT . . . . . . . . . . . . .
     10.1 Termination. . . . . . . . . . . . . . . . . . . .
     10.2 Survival After Termination . . . . . . . . . . . .
   
ARTICLE 11MISCELLANEOUS. . . . . . . . . . . . . . . . . . .
     11.1 Expenses . . . . . . . . . . . . . . . . . . . . .
     11.2 Notices. . . . . . . . . . . . . . . . . . . . . .
     11.3 Successors and Assigns . . . . . . . . . . . . . .
     11.4 Amendment and Waiver . . . . . . . . . . . . . . .
     11.5 Counterparts . . . . . . . . . . . . . . . . . . .
     11.6 Headings . . . . . . . . . . . . . . . . . . . . .
     11.7 GOVERNING LAW. . . . . . . . . . . . . . . . . . .
     11.8 Severability . . . . . . . . . . . . . . . . . . .
     11.9 Entire Agreement . . . . . . . . . . . . . . . . .
     11.10Further Assurances . . . . . . . . . . . . . . . .
                  11.11Public Announcements . . <PAGE>
   
SCHEDULE 3.2   Subsidiaries of the Company
   
SCHEDULE 3.4   Required Consents
   
                  EXHIBIT A      Form of Opinion of Counsel to the Company<PAGE>
   STOCK P               URCHASE AGREEMENT
                               
          STOCK PURCHASE AGREEMENT, dated as of October 8,
   1998  (this  Agreement ), by and between CD RADIO INC., a
   Delaware corporation (the  Company ), and PRIME 66 PARTNERS,
   L.P., a Texas limited partnership (the  Purchaser ).
   
          WHEREAS, the Company proposes to issue and sell to
   the Purchaser, and the Purchaser proposes to buy, for an
   aggregate purchase price of One Hundred Million Dollars
   ($100,000,000), a total of 5,000,000 shares of Common Stock,
   par value $.001 per share, of the Company;
          NOW, THEREFORE, in consideration of the mutual
   covenants and agreements set forth herein and for good and
   valuable consideration, the receipt and adequacy of which is
   hereby acknowledged, the parties hereto agree as follows:
   
   
                              ARTICLE 1
   
                             DEFINITIONS
   
          1.1  Definitions.  As used in this Agreement, and
   unless the context requires a different meaning, the follow-
   
   ing terms shall have the meanings set forth below:
   
           Affiliate  means a Person that directly, or
   indirectly through one or more intermediaries, controls or
   is controlled by, or is under common control with the Person
   specified.
   
           Agreement  means this Agreement as the same may
   be amended, supplemented or modified in accordance with the
   terms hereof.
   
           Beneficial Owner  shall mean a Person who
   beneficially owns any securities within the meaning of Rule
   13d-3 under the Exchange Act, and  beneficially owned  and
    beneficial ownership  shall have correlative meanings.
   
           Business Day  means any day other than Saturday,
   Sunday or other day on which commercial banks in the State
   of New York are authorized or required by law or executive
   order to close.
   
           Bylaws  means the bylaws of the Company, as the
   same may have been amended and in effect as of the Closing
   Date.
   
           Certificate of Incorporation  means the Amended
   and Restated Certificate of Incorporation of the Company, as
   the same may have been amended and in effect as of the
   Closing Date.
   
           Claims  means actions, causes of action, suits,
   claims, complaints, demands, litigations or legal,
   administrative or arbitral proceedings.
   
           Closing  has the meaning assigned to such term in
   Section 2.2.
           Closing Date  has the meaning assigned to such
   term in Section 2.2.
   
           Commission  means the Securities and Exchange
   Commission or any similar agency then having jurisdiction to
   enforce the Securities Act.
   
           Common Stock  means the Common Stock, par value
   $.001 per share, of the Company, or any other capital stock
   of the Company into which such stock is reclassified or
   reconstituted.
   
           Contemplated Transactions  means the transactions
   contemplated by this Agreement, including without limitation
   the purchase and sale of the Purchased Shares.
   
           Contractual Obligation  means, as to any Person,
   any agreement, undertaking, contract, indenture, mortgage,
   deed of trust or other instrument to which such Person is a
   party or by which it or any of its property is bound.  
   
           Convertible Preferred Stock  means the Company's
   10 1/2% Series C Convertible Preferred Stock.
   
           Exchange Act  means the Securities Exchange Act
   of 1934, as amended, and the rules and regulations of the
   Commission thereunder.
   
           GAAP  means United States generally accepted
   accounting principles as in effect from time to time.
   
           Governmental Authority  means the government of
   any nation, state, city, locality or other political
   subdivision of any thereof, and any entity exercising
   executive, legislative, judicial, regulatory or
   administrative functions of or pertaining to government or
   any International regulatory body having or asserting
   jurisdiction over a Person, its business or its properties.
   
           HSR Act  means the Hart-Scott-Rodino Antitrust
   Improvements Act of 1976, as amended, and the rules and
   regulations of the Federal Trade Commission thereunder.
   
           Lien  means any mortgage, deed of trust, pledge,
   hypothecation, assignment, encumbrance, lien (statutory or
   other), restriction or other security interest of any kind
   or nature whatsoever.
   
           NASD  means the National Association of
   Securities Dealers, Inc.
   
           Person  means any individual, firm, corporation,
   partnership, limited liability company, trust, incorporated
   or unincorporated association, joint venture, joint stock
   company, Governmental Authority or other entity of any kind.
   
           Prospectus  shall mean the prospectus included in
   any Registration Statement (including without limitation a
   prospectus that discloses information previously omitted
   from a prospectus filed as part of an effective registration
   statement in reliance upon Rule 430A promulgated under the
   Securities Act), as amended or supplemented by any
   prospectus supplement, with respect to the terms of the
   offering of any portion of the Registrable Securities
   covered by such Registration Statement and all other
   amendments and supplements to such prospectus, including
   post-effective amendments, and all material incorporated by
   reference or deemed to be incorporated by reference in such
   prospectus.
   
           Purchased Shares  has the meaning assigned to
   such term in Section 2.1.
   
           Registrable Securities  shall mean each of the
   Purchased Shares and any capital stock of the Company issued
   as a dividend or other distribution with respect to, or in
   exchange for or in replacement of, such Purchased Shares,
   until, in the case of any such share, (i) it is effectively
   registered under the Securities Act and disposed of in
   accordance with the Registration Statement covering it,
   (ii) in the opinion of counsel to the Company, it is
   saleable by the holder thereof pursuant to Rule 144(k), or
   (iii) it is distributed to the public by the holder thereof
   pursuant to Rule 144; provided, however, that for purposes
   of Sections 9.1, 9.2 and Article 6, Registrable Securities
   shall not include any Purchased Shares that are subject to a
   lock-up agreement during the period in which disposition of
   such Purchased Shares would violate the terms of such lock-
   up agreement.
   
           Registration Expenses  means all expenses
   incurred by the Company in compliance with Article 9,
   including without limitation all registration and filing
   fees, printing expenses, fees and disbursements of counsel
   for the Company, blue sky fees and expenses and the expense
   of any special audit incident to or required by any such
   registration.
   
           Registration Statement  shall mean any
   registration statement of the Company under the Securities
   Act that covers any of the Registrable Securities pursuant
   to the provisions of this Agreement, including the related
   Prospectus, all amendments and supplements to such
   registration statement (including post-effective
   amendments), all exhibits and all material incorporated by
   reference or deemed to be incorporated by reference in such
   registration statement.
   
           Requirement of Law  means, as to any Person, the
   Certificate of Incorporation and Bylaws or other organiza-
   
   tional or governing documents of such Person, and any law,
   treaty, rule, regulation, qualification, license or
   franchise or determination of an arbitrator or a court or
   other Governmental Authority, in each case applicable or
   binding upon such Person or any of its property or to which
   such Person or any of its property is subject or pertaining
   to any or all of the transactions contemplated hereby.
   
           Rule 144  shall mean Rule 144 promulgated by the
   Commission under the Securities Act, as such Rule may be
   amended from time to time, or any similar rule or regulation
   hereafter adopted by the Commission.
   
           SEC Reports  means all proxy statements,
   registration statements, reports and other documents filed
   or required to be filed by the Company or any of its
   Subsidiaries with the Commission pursuant to the Securities
   Act or the Exchange Act since December 31, 1997.
   
           Securities Act  means the Securities Act of 1933,
   as amended, and the rules and regulations of the Commission
   thereunder.
   
           Selling Expense   means all underwriting
   discounts and commissions applicable to the sale of the
   Purchased Shares.
   
           Subsidiary  means in respect of any Person any
   other Person which, at the time as of which any
   determination is made, such Person or one or more of its
   Subsidiaries has, directly or indirectly, voting control.
   
           Transfer  means any sale, assignment,
   hypothecation, transfer or other disposition.   Transferor 
   and  Transferee  shall have correlative meanings.
   
   
                              ARTICLE 2
   
                 PURCHASE AND SALE OF SECURITIES
   
          2.1  Purchase and Sale of Securities.  Subject to
   the terms herein set forth and in reliance upon the
   representations set forth below, the Company agrees to sell
   to the Purchaser, and the Purchaser agrees to purchase from
   the Company, on the Closing Date, 5,000,000 shares of Common
   Stock for the aggregate purchase price of $100,000,000 (all
   of the shares of Common Stock being purchased pursuant
   hereto being referred to herein as the  Purchased Shares ).
   
          2.2  Closing.  The purchase and issuance of the
   Purchased Shares shall take place at a closing (the
    Closing ) to be held at the offices of Paul, Weiss,
   Rifkind, Wharton & Garrison, 1285 Avenue of the Americas,
   New York, New York 10019-6064, at 10:00 A.M., local time, on
   the first Business Day after the conditions to closing set
   forth in Articles 7 and 8 have been satisfied or waived by
   the party entitled to waive such condition (the  Closing
   Date ).  At the Closing, the Company shall deliver to the
   Purchaser certificates representing the Purchased Shares,
   duly registered in the name of the Purchaser or its nominee,
   and the Purchaser shall deliver to the Company the aggregate
   purchase price therefor by wire transfer of immediately
   available funds to an account designated in writing by the
   Company to the Purchaser at least two Business Days before
   the Closing.
   
   
                              ARTICLE 3
   
            REPRESENTATIONS AND WARRANTIES OF THE COMPANY
   
          The Company hereby represents and warrants to the
   Purchaser as follows:
   
          3.1  Corporate Existence and Power.  The Company
   (a) is a corporation duly incorporated, validly existing and
   in good standing under the laws of the State of Delaware;
   (b) has all requisite corporate power and authority to own
   and operate its property, to lease the property it operates
   as lessee and to conduct the business in which it is
   engaged; and (c) has the corporate power and authority to
   execute, deliver and perform its obligations under this
   Agreement.  The Company is duly qualified to do business as
   a foreign corporation in, and is in good standing under the
   laws of, each jurisdiction in which the conduct of its
   business or the nature of the property owned requires such
   qualification.
   
          3.2  Subsidiaries.  Except as set forth on
   Schedule 3.2, the Company has no Subsidiaries and no
   interest or investments in any corporation, partnership,
   limited liability company, trust or other entity or
   organization.  Each Subsidiary listed on Schedule 3.2 has
   been duly organized, is validly existing and in good
   standing under the laws of the jurisdiction of its
   organization, has the power and authority (corporate or
   otherwise) to own its properties and to conduct its business
   and is duly registered, qualified and authorized to transact
   business and is in good standing in each jurisdiction in
   which the conduct of its business or the nature of its
   properties requires such registration, qualification or
   authorization.  Except as disclosed on Schedule 3.2, all of
   the issued and outstanding capital stock (or equivalent
   interests) of each Subsidiary set forth on Schedule 3.2 has
   been duly authorized and validly issued, is fully paid and
   non-assessable and is owned by the Company free and clear of
   any Liens and there are no rights, options or warrants
   outstanding or other agreements to acquire shares of capital
   stock (or equivalent interests) of such Subsidiary.
   
          3.3  Corporate Authorization; No Contravention. 
   The execution, delivery and performance by the Company of
   this Agreement and the transactions contemplated hereby,
   including, without limitation, the sale, issuance and
   delivery of the Purchased Shares, (a) have been duly
   authorized by all necessary corporate action of the Company;
   (b) do not contravene the terms of the Certificate of
   Incorporation or Bylaws or the organizational documents of
   its Subsidiaries; and (c) do not violate, conflict with or
   result in any breach or contravention of, or the creation of
   any Lien under, any Contractual Obligation of the Company or
   any Requirement of Law applicable to the Company or its
   Subsidiaries.  No event has occurred and no condition exists
   which, upon notice or the passage of time (or both), would
   constitute a default under any indenture, mortgage, deed of
   trust, credit agreement, note or other evidence of
   indebtedness or other material agreement of the Company or
   its Subsidiaries or the Certificate of Incorporation or
   Bylaws or the organizational documents of the Company's
   Subsidiaries.
   
          3.4  Governmental Authorization; Third Party
   Consents.  Except for the approvals and consents as
   specified on Schedule 3.4 hereto (collectively, the
    Required Consents ), no approval, consent, exemption,
   authorization or other action by, or notice to, or filing
   with, any Governmental Authority or any other Person in
   respect of any Requirement of Law, Contractual Obligation or
   otherwise, and no lapse of a waiting period under a
   Requirement of Law, is necessary or required in connection
   with the execution, delivery or performance (including,
   without limitation, the sale, issuance and delivery of the
   Purchased Shares) by the Company, or enforcement against the
   Company, of this Agreement, or the transactions contemplated
   hereby.
   
          3.5  Binding Effect.  This Agreement has been duly
   executed and delivered by the Company and constitutes the
   legal, valid and binding obligation of the Company
   enforceable against the Company in accordance with its
   terms, except as enforceability may be limited by applicable
   bankruptcy, insolvency, fraudulent conveyance or transfer,
   moratorium or other similar laws affecting the enforcement
   of creditors' rights generally and by general principles of
   equity. 
   
          3.6  Capitalization of the Company.  The
   authorized capital stock of the Company consists of
   (i) 200,000,000 shares of Common Stock, of which
   17,761,122 shares were issued and outstanding on
   September 23, 1998 and 5,060,330 shares which were, as of
   September 23, 1998, reserved for issuance upon the exercise
   of outstanding stock options, warrants to purchase Common
   Stock and conversion of Convertible Preferred Stock issuable
   pursuant to warrants to purchase Convertible Preferred
   Stock, and (ii) 50,000,000 shares of Preferred Stock, of
   which 1,538,561 shares of Convertible Preferred Stock were
   issued and outstanding on September 23, 1998.  Each share of
   Convertible Preferred Stock may be converted at any time, at
   the option of the holder, unless previously redeemed, into a
   number of shares of Common Stock calculated by dividing the
   $100 liquidation preference of the Convertible Preferred
   Stock (without accrued and unpaid dividends) by $18 (as
   adjusted from time to time).  Except (a) as set forth in
   this Section 3.6, (b) shares of Common Stock issued
   (i) pursuant to the exercise of outstanding stock options or
   warrants or (ii) on the conversion of outstanding shares of
   Convertible Preferred Stock and (c) options granted under
   existing stock option plans, plans subject to stockholder
   approval or plans for which stockholder approval has been
   obtained, on the Closing Date there will be no shares of
   Common Stock or any other equity security of the Company
   issuable upon conversion or exchange of any security of the
   Company nor will there be any rights, options or warrants
   outstanding or other agreements to acquire shares of capital
   stock of the Company nor will the Company be contractually
   obligated to purchase, redeem or otherwise acquire any of
   its outstanding shares of capital stock.  Except for Loral
   Space & Communications, Ltd. ( Loral ), no stockholder of
   the Company is entitled to any preemptive or similar rights
   to subscribe for shares of capital stock of the Company. 
   All of the issued and outstanding shares of Common Stock and
   Convertible Preferred Stock are, and the Purchased Shares
   (when issued hereunder) after payment therefor to the
   Company, will be, duly authorized, and validly issued, fully
   paid and nonassessable.
   
          3.7  SEC Filings; Financial Statements.  The
   Company has timely filed all SEC Reports.  The SEC Reports
   complied in all material respects with the applicable
   requirements of the Securities Act or the Exchange Act, as
   applicable, and did not contain any untrue statement of a
   material fact or omit to state a material fact required to
   be stated therein or necessary in order to make the
   statements in the SEC Reports, in light of the circumstances
   under which they were made, not misleading.  Each of the
   Company's financial statements (including, in each case, any
   related notes) contained in the SEC Reports, complied as to
   form in all material respects with applicable published
   rules and regulations of the Commission with respect
   thereto, was prepared in accordance with GAAP applied on a
   consistent basis throughout the periods involved (except as
   may be indicated in the notes to such financial statements)
   and fairly presented the financial position of the Company
   and its Subsidiaries as at the respective dates and for the
   periods indicated, except that the unaudited financial
   statements were subject to normal and recurring year-end
   adjustments which were not or are not expected to be
   material in amount or effect.
   
          3.8  Absence of Certain Developments.  Since
   June 30, 1998, except as set forth in the SEC Reports
   delivered to the Purchaser, there has been no material
   adverse change, or any development involving a prospective
   material adverse change, in or affecting the business,
   management or condition, financial or otherwise, of the
   Company and its Subsidiaries, taken as a whole.
   
          3.9  Compliance with Laws.  None of the Company or
   its Subsidiaries is in material violation of any Requirement
   of Law to which it is subject.
   
          3.10 Licenses.  The Company has no reason to
   believe that either (a) it will not finally obtain any
   license, permit, franchise or other authorizations necessary
   for it to conduct its business as described in the SEC
   Reports or (b) such license, permit, franchise or
   authorization will not be obtained on a timely basis.
   
          3.11 Litigation.  Except with respect to certain
   filings made with the Federal Communications Commission by
   Primosphere, there is no legal action, suit, arbitration or
   other legal, administrative or other governmental
   investigation, inquiry or proceeding pending, or to the best
   knowledge of the Company, threatened against or affecting
   the Company or its Subsidiaries which, if determined
   adversely to the Company, would have a material adverse
   effect on its business or financial condition.
   
          3.12 Intellectual Property.  The Company and its
   Subsidiaries own, free and clear of all Liens, and has good
   and marketable title to, or holds adequate licenses or
   otherwise possesses all such rights as are necessary to use
   all patents (and applications therefor), patent disclosures,
   trademarks, service marks, trade names, copyrights (and
   applications therefor), inventions, discoveries, processes,
   know-how, scientific, technical, engineering and marketing
   data, formulae and techniques (collectively,  Intellectual
   Property ) used or proposed to be used in or necessary for
   the conduct of its business as now conducted or as proposed
   to be conducted in the SEC Reports.  The Company has not
   received notice or otherwise has reason to know of any
   conflict or alleged conflict with the rights of others
   pertaining to the Company s Intellectual Property.  To the
   best of the Company's knowledge, the business of the Company
   as presently conducted and as proposed to be conducted in
   the SEC Reports does not infringe upon or violate any
   Intellectual Property rights of others.
   
          3.13 Private Offering.  No form of general
   solicitation or general advertising was used by the Company
   or its representatives in connection with the offer or sale
   of the Purchased Shares.  No registration of the Purchased
   Shares pursuant to the provisions of the Securities Act or
   any state securities or  blue sky  laws will be required by
   the offer, sale, or issuance of the Purchased Shares
   pursuant to this Agreement, assuming the accuracy of the
   Purchaser's representation contained in Section 4.5.
   
   
                           ARTICLE 4
   
           REPRESENTATIONS AND WARRANTIES OF THE PURCHASER
   
          The Purchaser hereby represents and warrants to
   the Company as follows:
   
          4.1  Existence and Power.  The Purchaser (a) is
   duly organized and validly existing as a limited partnership
   under the laws of the jurisdiction of its formation and
   (b) has the requisite power and authority to execute,
   deliver and perform its obligations under this Agreement.
   
          4.2  Authorization; No Contravention.  The execu-
   
   tion, delivery and performance by the Purchaser of this
   Agreement and the transactions contemplated hereby, includ-
   
   ing, without limitation, the purchase of the Purchased
   Shares, (a) have been duly authorized by all necessary
   action, (b) do not contravene the terms of the Purchaser's
   organizational documents, or any amendment thereof, and
   (c) do not violate, conflict with or result in any breach or
   contravention of, or the creation of any Lien under, any
   Contractual Obligation of the Purchaser or any Requirement
   of Law applicable to the Purchaser, except for such
   violation, conflict, breach or Lien which will not result in
   a material adverse effect on the Purchaser's ability to
   consummate the Contemplated Transactions.
   
          4.3  Governmental Authorization; Third Party
   Consents.  Except for the Required Consents, no approval,
   consent, exemption, authorization, or other action by, or
   notice to, or filing with, any Governmental Authority or any
   other Person in respect of any Requirement of Law, and no
   lapse of a waiting period under a Requirement of Law, is
   necessary or required in connection with the execution,
   delivery or performance by the Purchaser, or enforcement
   against the Purchaser, of this Agreement or the consummation
   of the Contemplated Transactions.
          4.4  Binding Effect.  This Agreement has been duly
   executed and delivered by the Purchaser and constitutes the
   legal, valid and binding obligation of the Purchaser,
   enforceable against it in accordance with its terms, except
   as enforceability may be limited by applicable bankruptcy,
   insolvency, reorganization, fraudulent conveyance or
   transfer, moratorium or similar laws affecting the
   enforcement of creditors' rights generally or by general
   principles of equity.
   
          4.5  Purchase for Own Account.  The Purchased
   Shares to be acquired by the Purchaser pursuant to this
   Agreement are being acquired for its own account and with no
   intention of distributing or reselling such Purchased Shares
   or any part thereof in any transaction that would be in
   violation of the securities laws of the United States of
   America or any state, without prejudice, however, to the
   rights of the Purchaser at all times to sell or otherwise
   dispose of all or any part of such Purchased Shares under an
   effective Registration Statement under the Securities Act or
   under an exemption from said registration available under
   the Securities Act.  The Purchaser understands and agrees
   that if the Purchaser should in the future decide to dispose
   of any Purchased Shares, it may do so only in compliance
   with the Securities Act and applicable state securities
   laws, as then in effect.  The Purchaser agrees to the
   imprinting, so long as required by law, of a legend on all
   certificates representing such Purchased Shares to the
   following effect:
   
          THE SECURITIES REPRESENTED BY THIS CERTIFICATE
             HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
             OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY
             STATE AND MAY NOT BE OFFERED FOR SALE, SOLD OR
             OTHERWISE TRANSFERRED EXCEPT PURSUANT TO AN EFFEC-
             
             TIVE REGISTRATION STATEMENT UNDER SUCH ACT AND
             APPLICABLE STATE SECURITIES LAWS OR PURSUANT TO AN
             APPLICABLE EXEMPTION FROM THE REGISTRATION
             REQUIREMENTS OF SUCH ACT AND SUCH LAWS.
   
          4.6  Sufficient Funds.  The Purchaser has
   sufficient funds, either in the form of cash or committed
   lines of credit, to purchase the Purchased Shares in
   accordance with the terms of this Agreement and to perform
   its obligations hereunder.
   
   
                              ARTICLE 5
   
                              COVENANTS
   
          5.1  Conduct of Business.  From the date hereof
   through the Closing Date, the Company and its Subsidiaries
   shall conduct their businesses in a manner such that the
   representations and warranties contained in Article 3 shall
   continue to be true and correct in all material respects on
   and as of the Closing Date (except for representations and
   warranties made as of a specific date) as if made on and as
   of the Closing Date.  The Company shall give the Purchaser
   prompt notice of any event, condition or circumstance
   occurring from the date hereof through the Closing Date that
   would constitute a violation or breach of (i) any
   representation or warranty, whether made as of the date
   hereof or as of the Closing Date, or (ii) any covenant of
   the Company contained in this Agreement.
   
          5.2  Indemnification of Brokerage.  The Company
   represents and warrants to the Purchaser that no broker,
   finder, agent or similar intermediary (a  Broker ) has acted
   on behalf of the Company or its Subsidiaries in connection
   with this Agreement or the Contemplated Transactions, and
   that, except for a fee to Batchelder & Partners, Inc. (the
    Sellers  Fee ), there are no brokerage commissions,
   finder's fees or similar fees or commissions payable in
   connection therewith based on any agreement, arrangement or
   understanding with the Company or any of the Subsidiaries or
   any action taken by the Company or any of its Subsidiaries. 
   The Company agrees to pay the Sellers' Fee and to indemnify
   and hold harmless the Purchaser from any Claim or demand for
   commission or other compensation by any Broker claiming to
   have been employed by or on behalf of the Company or any of
   its Subsidiaries and to bear the cost of legal expenses
   incurred in defending against any such claim.  The Purchaser
   represents and warrants to the Company that no Broker has
   acted on behalf of the Purchaser in connection with this
   Agreement or the Contemplated Transactions, and that there
   are no brokerage commissions, finders' fees or similar fees
   or commissions payable in connection therewith based on any
   agreement, arrangement or understanding with the Purchaser,
   or any action taken by the Purchaser.  The Purchaser agrees
   to indemnify and hold harmless the Company from any Claim or
   demand for commission or other compensation by any Broker
   claiming to have been employed by or on behalf of the
   Purchaser, and to bear the cost of legal expenses incurred
   in defending against any such claim.
   
          5.3  Rule 144.  The Company hereby covenants and
   agrees with the Purchaser that it shall file all reports
   required to be filed by it under the Securities Act and the
   Exchange Act and shall take such further action as the
   Purchaser may reasonably request, all to the extent required
   to enable the Purchaser to sell the Purchased Shares
   pursuant to and in accordance with Rule 144 adopted by the
   Commission under the Securities Act (as such rule may be
   amended from time to time) ( Rule 144 ) or any similar rule
   or regulation hereafter adopted by the Commission.  Such
   action shall include, but not be limited to, making
   available adequate current public information meeting the
   requirements of paragraph (c) of Rule 144.
          5.4  HSR Approval.  Promptly upon execution and
   delivery (and in any event within three (3) Business Days of
   the date) of this Agreement, the Purchaser and the Company
   will prepare and file, or cause to be prepared and filed,
   with the appropriate Governmental Authorities, a
   notification with respect to the Contemplated Transactions
   pursuant to the HSR Act, supply all information requested by
   Governmental Authorities in connection with the HSR Act
   notification and cooperate with each other in responding to
   any such request. 
   
          5.5  Stockholder Approval.  As promptly as
   possible following the execution of this Agreement, the
   Company shall seek to obtain approval of the Contemplated
   Transactions from its stockholders and, in connection
   therewith, shall make such filings and prepare and
   distribute to its stockholders such documents as shall be
   necessary to complete the Contemplated Transactions.
   
          5.6  Amendment to Rights Agreement and Board
   Approval.  The Company hereby covenants and agrees with the
   Purchaser that on or before the Closing Date it shall
   (a) amend the Rights Agreement, dated as of October 22, 1997
   (the  Rights Agreement ), between the Company and
   Continental Stock Transfer & Trust Company, as rights agent,
   to render the Rights Agreement inapplicable to the
   Contemplated Transactions and permit the Purchaser, and any
   other Person deemed to  Beneficially Own  the shares of
   Common Stock owned by the Purchaser (within the meaning of
   the Rights Agreement), to purchase and own up to an
   additional 1% of the outstanding shares of Common Stock
   without the Purchaser becoming an  Acquiring Person  under
   the Rights Agreement and (b) take all action necessary to
   cause the restrictions contained in Section 203 of the
   Delaware General Corporation Law to be inapplicable to the
   Contemplated Transactions and to approve the Purchaser
   becoming an  interested stockholder  within the meaning of
   Section 203 of the Delaware General Corporation Law.
   
   
                             ARTICLE 6
   
                        LOCK-UP AGREEMENTS
   
          At any time prior to the earlier of (a) October 1,
   2001 and (b) the date that the Purchaser ceases to
   beneficially own 10% or more of the Common Stock, the
   Company and its underwriters, by written notice from the
   Company and its lead underwriter to the Purchaser (a  Lock-
   up Request ), given as provided herein on or after the time
   of the initial filing with the Commission of any
   registration statement (other than a registration statement
   relating to an offering described in Section 9.1) with
   respect to any offering of Common Stock or securities
   convertible into Common Stock (the  Offering ), may request
   that the Purchaser agree not to offer, sell or transfer any
   of the Purchased Shares, or engage in any hedging
   transactions with respect to the Purchased Shares, during
   the 180-day period (the  Lock-up Period ) beginning on a
   date specified in the Lock-up Request, which date may be as
   early as five (5) Business Days prior to the expected
   effective date (but no later than the effective date) with
   respect to the registration statement for the Offering, and
   the Purchaser agrees to consent to and be bound by the
   restrictions specified in any such Lock-up Request;
   provided, however, that such a lock-up agreement with
   respect to any Offering shall not prevent Purchaser from
   selling Purchased Shares which it is entitled to sell in
   such Offering pursuant to Section 9.2 if it shall have made
   the request specified therein.  The Company shall specify
   the expected effective date of any Offering by notice to the
   Purchaser given not later than two (2) Business Days prior
   to the beginning of the Lock-up Period.  The Purchaser shall
   cause each Person to whom it Transfers, in one or a series
   of related transactions, 1,000,000 or more shares of Common
   Stock to execute and deliver to the Company a letter
   agreement pursuant to which such transferee agrees (and to
   cause each other Person to whom it Transfers any shares of
   Common Stock if, after giving effect to such Transfer, such
   Person, together with its Affiliates, would beneficially own
   1,000,000 or more shares of Common Stock to execute and
   deliver to the Company a similar letter agreement) to comply
   with the requirements of this Article 6 (including this
   sentence) to the same extent and subject to the same terms
   and conditions as the Purchaser.
   
   
                              ARTICLE 7
   
                CONDITIONS PRECEDENT TO THE OBLIGATION
                       OF THE PURCHASER TO CLOSE
                                    
          The obligation of the Purchaser to enter into and
   complete the Closing is subject, at the option of the
   Purchaser acting in accordance with the provisions of
   Article 10 with respect to termination of this Agreement, to
   the fulfillment on or prior to the Closing Date of the
   following conditions, any one or more of which may be waived
   by the Purchaser:
   
          7.1  Representations and Covenants.  The
   representations and warranties of the Company contained in
   this Agreement shall be true in all material respects on and
   as of the Closing Date with the same force and effect as
   though made on and as of the Closing Date; the Company shall
   have performed and complied with all covenants and
   agreements required by this Agreement to be performed or
   complied with by the Company on or prior to the Closing
   Date; and the Company shall have delivered to the Purchaser
   a certificate, dated the date of the Closing and signed by
   an executive officer of the Company, to the foregoing
   effect.
   
          7.2  Consents and Approvals.  All Required
   Consents shall have been obtained and be in full force and
   effect, and the Purchaser shall have been furnished with
   evidence reasonably satisfactory to it that such Required
   Consents have been granted and obtained.
   
          7.3  Opinion of Counsel to the Company.  The
   Purchaser shall have received the legal opinion of Paul,
   Weiss, Rifkind, Wharton & Garrison, counsel to the Company,
   dated the date of the Closing, addressed to the Purchaser,
   to the effect set forth in Exhibit A.
   
          7.4  HSR Act.  Any Person required in connection
   with the Contemplated Transactions to file a notification
   and report form in compliance with the HSR Act shall have
   filed such form and the applicable waiting period with
   respect to each such form (including any extension thereof
   by reason of a request for additional information) shall
   have expired or been terminated.
   
          7.5  No Claims.  No Claims shall be pending before
   any Governmental Authority (including investigations
   instituted by the United States Department of Justice or the
   Federal Trade Commission in connection with antitrust
   regulations) to restrain or prohibit this Agreement or the
   consummation of the Contemplated Transactions.
   
   
                              ARTICLE 8
   
                CONDITIONS PRECEDENT TO THE OBLIGATION
                       OF THE COMPANY TO CLOSE
   
          The obligation of the Company to enter into and
   complete the Closing is subject, at the option of the
   Company acting in accordance with the provisions of
   Article 10 with respect to termination of this Agreement, to
   the fulfillment on or prior to the Closing Date of the
   following conditions, any one or more of which may be waived
   by the Company:
   
          8.1  Representations and Covenants.  The
   representations and warranties of the Purchaser contained in
   this Agreement shall be true in all material respects on and
   as of the Closing Date with the same force and effect as
   though made on and as of the Closing Date; the Purchaser 
   shall have performed and complied with all covenants and
   agreements required by this Agreement to be performed or
   complied with by it on or prior to the Closing Date; and the
   Purchaser shall have delivered to the Company a certificate,
   dated the date of the Closing and signed by a general
   partner of the Purchaser, to the foregoing effect.
   
          8.2  Consents and Approvals.  All Required
   Consents shall have been obtained and be in full force and
   effect.
   
          8.3  HSR Act.  Any Person required in connection
   with the Contemplated Transactions to file a notification
   and report form in compliance with the HSR Act shall have
   filed such form and the applicable waiting period with
   respect to each such form (including any extension thereof
   by reason of a request for additional information) shall
   have expired or been terminated.
   
          8.4  No Claims.  No Claims shall be pending before
   any Governmental Authority (including investigations
   instituted by the United States Department of Justice or the
   Federal Trade Commission in connection with antitrust
   regulations) to restrain or prohibit this Agreement or the
   consummation of the Contemplated Transactions.
   
                              ARTICLE 9
   
                         REGISTRATION RIGHTS
   
          9.1  Requested Registration.  If the Company shall
   receive from the Purchaser, at any time after October 1,
   2000, a written request (which shall specify whether the
   distribution will be made by means of an underwriting) that
   the Company effect any registration with respect to all or a
   part of the Purchased Shares that constitute Registrable
   Securities (a  Demand Notice ), which Demand Notice shall
   request registration of not less than 1,000,000 shares of
   Common Stock or all remaining shares of Common Stock then
   held by the Purchaser, the Company will, as soon as
   practicable, use its best efforts to effect such
   registration as may be so requested and as would permit or
   facilitate the sale and distribution of the Purchased Shares
   as are specified in such request.  After the Company has
   effected two (2) such registrations pursuant to this
   Section 9.1 and such registration has been declared
   effective and the distribution contemplated thereunder
   completed, the Company shall have no further obligation
   under this Section 9.1.  Notwithstanding the foregoing, if
   the Company shall furnish to the Purchaser a certificate
   signed by the President or the Chief Executive Officer of
   the Company stating that in the good faith judgment of the
   Board of Directors of the Company, it would be seriously
   detrimental to the Company and its stockholders for such
   registration statement to be filed and it is therefore
   desirable and in the best interests of the Company to defer
   the filing of such registration statement, then the Company
   shall have the right to defer such filing for a period of
   not more than 90 days after receipt of the request of the
   Purchaser.
   
          9.2  Company Registration.  (a)  If the Company
   shall determine to register any shares of Common Stock for
   the account of a security holder or holders (other than a
   registration relating solely to employee benefit plans, or a
   registration relating solely to a Commission Rule 145
   transaction, or a registration on any registration form
   which does not permit secondary sales or does not include
   substantially the same information as would be required to
   be included in a registration statement covering the sale of
   Purchased Shares), the Company will promptly give to the
   Purchaser a written notice thereof and include in such
   registration, and in any underwriting involved therein, all
   the Purchased Shares that constitute Registrable Securities
   specified in a written request made by the Purchaser within
   ten Business Days after receipt of the written notice from
   the Company described above.  The Purchaser shall be
   entitled to have its shares included in an unlimited number
   of registrations pursuant to Section 9.2.
   
               (b)  If the registration of which the Company
   gives notice is for a registered public offering involving
   an underwriting, the Company shall so advise the Purchaser
   as a part of the written notice given pursuant to
   Section 9.2(a).  In such event, the right of the Purchaser
   to registration pursuant to Section 9.2(a) shall be
   conditioned upon the Purchaser's participation in such
   underwriting and the inclusion of the Purchased Shares in
   the underwriting to the extent provided herein.  If the
   Purchaser shall have elected to exercise its rights under
   Section 9.2(a), it shall enter into an underwriting
   agreement in customary form with the representative of the
   underwriter or underwriters selected for underwriting by the
   Company.  Notwithstanding any other provision of this
   Section 9.2, if the representative determines and so advises
   the Company in writing that marketing factors require a
   limitation on the number of shares to be underwritten, the
   Company shall so advise the Purchaser.  In such an event,
   the number of Purchased Shares that may be included in the
   registration and underwriting by the Purchaser shall be
   reduced, on a pro rata basis (based on the number of shares
   held by the Purchaser and each other Person (other than the
   Company) registering shares under such registration), by
   such minimum number of shares as is necessary to comply with
   such limitation.  If the Purchaser disapproves of the terms
   of any such underwriting, it may elect to withdraw therefrom
   by written notice to the Company and the underwriter.  Any
   Purchased Shares excluded or withdrawn from such
   underwriting shall be withdrawn from such registration.
   
          9.3  Transferability.  The registration rights
   granted pursuant to this Article 9 shall be assignable, in
   whole but not in part, to any Transferee of the Purchased
   Shares; provided, however, that the rights granted under
   Section 9.1 shall be assignable only to a Transferee who,
   after giving effect to such Transfer, beneficially owns at
   least 1,000,000 shares of Common Stock.
   
          9.4  Expenses of Registration.  All Registration
   Expenses incurred in connection with any registration,
   qualification or compliance pursuant to this Article 9 shall
   be borne by the Company, and all Selling Expenses shall be
   borne by the Purchaser.
   
          9.5  Registration Procedures.  In the case of each
   registration effected by the Company pursuant to Article 9,
   the Company will:
   
               (a)  furnish to the Purchaser prior to the
   filing of the requisite Registration Statement copies of
   drafts of such Registration Statement as is proposed to be
   filed, and thereafter such number of copies of such
   Registration Statement, each amendment and supplement
   thereto (in each case including all exhibits thereto), the
   Prospectus included in such Registration Statement
   (including each preliminary prospectus) and such other
   documents in such quantities as the Purchaser may reasonably
   request from time to time in order to facilitate its
   distribution;
   
               (b)  notify the Purchaser promptly of any
   request by the Commission for the amending or supplementing
   of such Registration Statement or Prospectus or for
   additional information;
   
               (c)  advise the Purchaser promptly after the
   Company shall receive notice or obtain knowledge of the
   issuance of any stop order by the Commission suspending the
   effectiveness of any such Registration Statement or
   amendment thereto or of the initiation or threatening of any
   proceeding for that purpose, and promptly use its best
   efforts to prevent the issuance of any stop order or to
   obtain its withdrawal promptly if such stop order should be
   issued;
   
               (d)  use all reasonable efforts to register
   or qualify the Purchased Shares under such other securities
   or blue sky laws of such jurisdictions as the Purchaser (or
   the managing underwriter, in the case of underwritten
   offerings) reasonably requests; provided that the Company
   shall not be required to qualify to do business or become
   subject to service of process or taxation in any
   jurisdiction in which it is not already so qualified or
   subject;
   
               (e)  use all reasonable efforts to cause the
   Purchased Shares included in the Registration Statement to
   be listed on a securities exchange or authorized for
   quotation on a national quotation system on which any of the
   Common Stock is then listed;
   
               (f)  notify the Purchaser, at any time when a
   prospectus relating to the proposed sale is required to be
   delivered under the Securities Act, of the happening of any
   event as a result of which the Prospectus included in such
   Registration Statement or amendment contains an untrue
   statement of a material fact or omits to state any material
   fact required to be stated therein in order to make the
   statements therein, in light of the circumstances under
   which they were made, not misleading, and the Company will
   prepare a supplement or amendment to such Prospectus so
   that, as thereafter delivered to the purchasers of the
   Purchased Shares, such Prospectus will not contain an untrue
   statement of a material fact or omit to state any material
   fact required to be stated therein in order to make the
   statements therein, in light of the circumstances under
   which they were made, not misleading;
   
               (g)  enter into customary agreements
   (including without limitation, an underwriting agreement in
   customary form) and take such other actions as are
   reasonably required in order to expedite or facilitate the
   disposition of the Purchased Shares included in the
   Registration Statement; and
   
               (h)  in the case of a Registration Statement
   filed pursuant to Section 9.1 involving a shelf Registration
   Statement, prepare and file with the Commission such
   amendments and supplements to such shelf Registration
   Statement and the Prospectus used in connection therewith as
   may be necessary to keep such shelf Registration Statement
   effective until the earlier of (i) the sale of all
   Registrable Securities covered thereby or (ii) three years
   (exclusive of any period during which the distribution is
   postponed pursuant to Section 9.1), and to comply with the
   provisions of the Securities Act with respect to the sale or
   other disposition of all Registrable Securities covered by
   such Registration Statement. 
   
          9.6  Indemnification.  (a)  The Company will
   indemnify the Purchaser, each of its officers and directors,
   and each person controlling the Purchaser within the meaning
   of Section 15 of the Securities Act and the rules and
   regulations thereunder, with respect to each registration
   which has been effected pursuant to this Article 9, and each
   underwriter, if any, and each person who controls any
   underwriter within the meaning of Section 15 of the
   Securities Act and the rules and regulations thereunder,
   against all claims, losses, damages and liabilities (or
   actions in respect thereof) arising out of or based on any
   untrue statement (or alleged untrue statement) of a material
   fact contained in any Prospectus or other document
   (including any related registration statement, notification
   or the like) incident to any such registration,
   qualification or compliance, or based on any omission (or
   alleged omission) to state therein a material fact required
   to be stated therein or necessary to make the statements
   therein not misleading, or any violation by the Company of
   the Securities Act or any rule or regulation thereunder
   applicable to the Company and relating to action or inaction
   required of the Company in connection with any such
   registration, qualification or compliance, and will
   reimburse the Purchaser, each of its officers and directors,
   and each person controlling the Purchaser, each such
   underwriter and each person who controls any such
   underwriter, for any legal and any other expenses reasonably
   incurred in connection with investigating and defending any
   such claim, loss, damage, liability or action, provided that
   the Company will not be liable in any such case to the
   extent that any such claim, loss, damage, liability or
   expense arises out of or is based on any untrue statement or
   omission based upon written information furnished to the
   Company by the Purchaser with respect to the Purchaser and
   stated to be specifically for use therein.
   
               (b)  The Purchaser will, if Purchased Shares
   held by it are included in the securities as to which such
   registration, qualification or compliance is being effected,
   indemnify the Company, each of its directors and officers
   and each underwriter, if any, of the Company's securities
   covered by such a registration statement, each person who
   controls the Company or such underwriter within the meaning
   of Section 15 of the Securities Act and the rules and
   regulations thereunder, against all claims, losses, damages
   and liabilities (or actions in respect thereof) arising out
   of or based on any untrue statement (or alleged untrue
   statement) of a material fact with respect to the Purchaser
   contained in any such registration statement, prospectus or
   other document made by the Purchaser, or any omission (or
   alleged omission) to state therein a material fact with
   respect to the Purchaser required to be stated therein or
   necessary to make the statements by the Purchaser therein
   not misleading, and will reimburse the Company and such
   other directors, officers, partners, persons, underwriters
   or control persons for any legal or any other expenses
   reasonably incurred in connection with investigating or
   defending any such claim, loss, damage, liability or action,
   in each case to the extent, but only to the extent, that
   such untrue statement (or alleged untrue statement) or
   omission (or alleged omission) is made in such registration
   statement, prospectus or other document in reliance upon and
   in conformity with written information furnished to the
   Company by the Purchaser with respect to the Purchaser and
   stated to be specifically for use therein; provided,
   however, that the obligations of the Purchaser hereunder
   shall be limited to an amount equal to the proceeds to the
   Purchaser of securities sold as contemplated herein.
   
               (c)  If the indemnification provided for in
   this Section 9.6 is held by a court of competent
   jurisdiction to be unavailable to an indemnified party with
   respect to any loss, liability, claim, damage or expense
   referred to herein, then the indemnifying party, in lieu of
   indemnifying such indemnified party hereunder, shall
   contribute to the amount paid or payable by such indemnified
   party as a result of such loss, liability, claim, damage or
   expense in such proportion as is appropriate to reflect the
   relative fault of the indemnifying party on the one hand and
   of the indemnified party on the other in connection with the
   statements or omissions which resulted in such loss,
   liability, claim, damage or expense, as well as any other
   relevant equitable considerations.  The relative fault of
   the indemnifying party and of the indemnified party shall be
   determined by reference to, among other things, whether the
   untrue or alleged untrue statement of a material fact or the
   omission to state a material fact relates to information
   supplied by the indemnifying party or by the indemnified
   party and the parties' relative intent, knowledge, access to
   information and opportunity to correct or prevent such
   statement or omission.
   
   
                          ARTICLE 10
   
                   TERMINATION OF AGREEMENT
   
          10.1 Termination.  This Agreement may be
   terminated prior to the Closing as follows:
   
               (a)  at the election of the Purchaser, if any
   one or more of the conditions to the obligation of the
   Purchaser to close set forth in Article 7 has not been
   fulfilled as of March 31, 1999;
   
               (b)  at the election of the Company, if any
   one or more of the conditions to the obligation of the
   Company to close set forth in Article 8 has not been
   fulfilled as of March 31, 1999;
   
               (c)  at the election of the Company or the
   Purchaser, if any legal proceeding is commenced and pending
   by any Governmental Authority seeking to prevent the
   consummation of the Closing or any other Contemplated
   Transaction and the Company or the Purchaser, as the case
   may be, reasonably and in good faith deems it impracticable
   or inadvisable to proceed in view of such legal proceeding;
   
               (d)  at the election of the Company, if the
   Purchaser has breached any material representation,
   warranty, covenant or agreement contained in this Agreement,
   which breach cannot be or is not cured by March 31, 1999;
   
               (e)  at the election of the Purchaser, if the
   Company has breached any material representation, warranty,
   covenant or agreement contained in this Agreement, which
   breach cannot be or is not cured by March 31, 1999; 
   
               (f)  at the election of the Purchaser, if the
   Closing Date shall not have occurred by March 31, 1999; or
   
               (g)  at any time on or prior to the Closing
   Date, by mutual written consent of the Company and the
   Purchaser.
   
          If this Agreement so terminates, it shall become
   null and void and have no further force or effect, except as
   provided in Section 10.2.
   
          10.2 Survival After Termination.  If this
   Agreement terminates pursuant to Section 10.1 and the
   Contemplated Transactions are not consummated, this
   Agreement shall become null and void and have no further
   force or effect, except that any such termination shall be
   without prejudice to the rights of any party on account of
   the nonsatisfaction of the conditions set forth in
   Articles 7 and 8 resulting from the intentional or willful
   breach or violation of the representations, warranties,
   covenants or agreements of another party under this
   Agreement.  Notwithstanding anything in this Agreement to
   the contrary, the provisions of Sections 5.3, this
   Section 10.2 and Article 11 shall survive any termination of
   this Agreement.
   
   
                              ARTICLE 11
   
                            MISCELLANEOUS
   
          11.1 Expenses.  Each of the Company and Purchaser
   shall pay its own expenses incurred in connection with the
   negotiation, execution, delivery and performance of this
   Agreement.
   
          11.2 Notices.  All notices or other communications
   required or permitted hereunder shall be in writing and
   shall be delivered personally, telecopied or sent by
   certified, registered or express mail, postage prepaid.  Any
   such notice shall be deemed given if delivered personally or
   telecopied, on the date of such delivery or sent by
   reputable overnight courier, on the first Business Day
   following the date of such mailing, as follows:
   
               (a)  if to the Company:
   
                    CD Radio Inc.
                    1180 Avenue of the Americas
                    New York, New York  10036
                    Attention:     Patrick L. Donnelly
                    Telecopy: (212) 899-5036
   
                    with a copy to:
   
                    Paul, Weiss, Rifkind, Wharton & Garrison
                    1285 Avenue of the Americas
                    New York, New York  10019-6064
                    Attention:     Mitchell S. Fishman
                    Telecopy: (212) 757-3990
   
               (b)  if to the Purchaser:
   
                    Prime 66 Partners, L.P.
                    201 Main Street
                    Suite 2600
                    Fort Worth, TX  76102
                    Attention:     W. R. Cotham
                    Telecopy: (817) 390-8739
   
                    with a copy to:
   
                    Kelly, Hart & Hallman
                    201 Main Street
                    Suite 2500
                    Fort Worth,  TX 76102
                    Attention:     Thomas W. Briggs, Esq
                    Telecopy: (817) 878-9280
   
   Any party may by notice given in accordance with this
   Section 11.2 designate another address or person for receipt
   of notices hereunder.
   
          11.3 Successors and Assigns.  This Agreement shall
   inure to the benefit of and be binding upon the successors
   and permitted assigns of the parties hereto.  No Person
   other than the parties hereto and their successors and
   permitted assigns is intended to be a beneficiary of this
   Agreement.  No party hereto may assign its rights under this
   Agreement without the prior written consent of the other
   party hereto.
   
          11.4 Amendment and Waiver.  
   
               (a)  No failure or delay on the part of the
   Company or the Purchaser in exercising any right, power or
   remedy hereunder shall operate as a waiver thereof, nor
   shall any single or partial exercise of any such right,
   power or remedy preclude any other or further exercise
   thereof or the exercise of any other right, power or remedy. 
   The remedies provided for herein are cumulative and are not
   exclusive of any remedies that may be available to the
   Company or the Purchaser at law, in equity or otherwise.
   
               (b)  Any amendment, supplement or modifica-
   
   tion of or to any provision of this Agreement and any waiver
   of any provision of this Agreement shall be effective only
   if it is made or given in writing and signed by the Company
   and the Purchaser.
   
          11.5 Counterparts.  This Agreement may be executed
   in any number of counterparts and by the parties hereto in
   separate counterparts, all of which when so executed shall
   be deemed to be an original and both of which taken together
   shall constitute one and the same agreement.
   
          11.6 Headings.  The headings in this Agreement are
   for convenience of reference only and shall not limit or
   otherwise affect the meaning hereof.
   
          11.7 GOVERNING LAW.  THIS AGREEMENT SHALL BE
   GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
   STATE OF NEW YORK WITHOUT REGARD TO THE CONFLICTS OF LAW
   PRINCIPLES THEREOF WHICH WOULD REQUIRE THE APPLICATION OF
   THE LAWS OF ANOTHER STATE.
   
          11.8 Severability.  If any one or more of the
   provisions contained herein, or the application thereof in
   any circumstance, is held invalid, illegal or unenforceable
   in any respect for any reason, the validity, legality and
   enforceability of any such provision in every other respect
   and of the remaining provisions hereof shall not be in any
   way impaired, unless the provisions held invalid, illegal or
   unenforceable shall substantially impair the benefits of the
   remaining provisions hereof.
   
          11.9 Entire Agreement.  This Agreement, together
   with the schedules and exhibits hereto, is intended by the
   parties as a final expression of their agreement and
   intended to be a complete and exclusive statement of the
   agreement and understanding of the parties hereto in respect
   of the subject matter contained herein and therein.  There
   are no restrictions, promises, warranties or undertakings,
   other than those set forth or referred to herein or therein. 
   This Agreement, together with the schedules and exhibits
   hereto, supersedes all prior agreements and understandings
   between the parties with respect to such subject matter.
   
          11.10     Further Assurances.  Each of the parties
   shall execute such documents and take, or cause to be taken,
   all appropriate action, and shall do or cause to be done,
   all things necessary, proper or advisable under applicable
   laws and regulations to consummate and make effective the
   Contemplated Transactions and obtaining any consents,
   exemptions, authorizations, or other actions by, or giving
   any notices to, or making any filings with, any Governmental
   Authority or any other Person.
   
          11.11     Public Announcements.  Except to the
   extent required by law or the regulations of any national
   securities exchange or the Nasdaq National Market, neither
   party hereto will issue or make any reports, statements or
   releases to the public with respect to this Agreement or the
   Contemplated Transactions without consulting the other.
   
   
          IN WITNESS WHEREOF, the parties hereto have caused
   this Agreement to be executed and delivered by their
   respective officers hereunto duly authorized as of the date
   first above written.
   
   
                         CD RADIO INC.
   
   
   
                         By:/s/ Andrew J. Greenebaum   
                         Name:     Andrew J.
   Greenebaum                      Title:    Executive Vice
   President                                 and Chief
   Financial                                 Officer
   
   
                         PRIME 66 PARTNERS, L.P.
   
                         By: P-66, INC., as general partner
   
                         By:/s/ William P. Hallman, Jr.
                         Name: William P. Hallman, Jr.
                         Title: Vice President
   
   
                         By:  P-66 GENPAR, L.P., 
                              as general partner
   
                         By:  Carmel Land & Cattle Co.,
                              as general partner
   
   
                         By:/s/ William P. Hallman, Jr.
                         Name: William P. Hallman, Jr.
                         Title:   Vice President
      <PAGE>
   
   
                                                          SCHEDULE 3.2
   
   
   
                     Subsidiaries of the Company
   
   
   
   
   
   
   
   Name
   Jurisdiction of
   Incorporation
   
   
   
   
   
   
   Satellite CD Radio, Inc.(1)
   Delaware
   
   
   
   
   
   
   
   
   
   --------
   1)     All of the stock of this Subsidiary is pledged to
   secure the Company s outstanding 15% Senior Secured Discount
      Notes due 2007<PAGE>
   
   
                                                          SCHEDULE 3.4
   
   
   
                          Required Consents
   
   
1a   The filings required under the HSR Act.
   
2a   Approval of the Company s common stockholders in
        accordance with rules of the NASD.
   
3a   Waiver by Loral Space & Communications Ltd. of its
        rights under Sections 5.2(b) and 5.3 of the Stock
        Purchase Agreement dated August 5, 1997 by and among CD
        Radio Inc., David Margolese and Loral Space &
        Communications Ltd. in respect of the Contemplated
        Transactions.
   
      <PAGE>
   
                                                             EXHIBIT A
   
   
   
             [Form of Opinion of Counsel to the Company]
   
   
          (i)  The Company has been duly incorporated and is
   validly existing as a corporation in good standing under the
   laws of the State of Delaware with full corporate power and
   authority to own, lease or operate its properties and to
   conduct its businesses as described in the SEC Reports and
   to consummate the transactions contemplated under this
   Agreement.
   
          (ii) The Purchased Shares have been duly
   authorized for issuance and sale to the Purchaser pursuant
   to this Agreement and, when issued in accordance with the
   terms of this Agreement, the Purchased Shares will be duly
   authorized, validly issued, fully paid and non-assessable
   shares of the Company, free of all preemptive or similar
   rights.
   
          (iii)     This Agreement has been duly authorized,
   executed and delivered by the Company and constitutes a
   valid and legally binding obligation of the Company
   enforceable against it in accordance with its terms, subject
   as to enforcement, to bankruptcy, insolvency,
   rehabilitation, reorganization and other laws of general
   applicability relating to or affecting creditors' rights and
   to general principles of equity.
   
          (iv) No consent, approval, authorization, order,
   registration or qualification of or with any Governmental
   Authority is required for the issue and sale of the
   Purchased Shares by the Company or the consummation by the
   Company of the Contemplated Transactions. 
   
          (v)  The issuance and sale of the Purchased Shares
   do not require registration under Section 5 of the
   Securities Act or qualification under any state securities
   or the blue sky laws of the State of New York.
   
   


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