Document:

Exhibit 4.74

 Exhibit 4.74 
 FIRST SUPPLEMENTAL INDENTURE 
 Senior Floating Rate Notes due 2013 
 FIRST SUPPLEMENTAL INDENTURE, dated as of July 28, 2008 (this “First Supplemental Indenture”), to the Indenture dated as of May 1, 2006 (the
“Indenture”), among XM Satellite Radio Inc., a Delaware corporation (the “Issuer”), XM Satellite Radio Holdings Inc., a Delaware corporation (the “Parent Guarantor”), XM Equipment Leasing LLC, a Delaware limited
liability company, as subsidiary guarantor, XM Radio Inc., a Delaware corporation, as subsidiary guarantor (together with XM Equipment Leasing LLC, the “Subsidiary Guarantors”), and The Bank of New York Mellon, a New York banking
corporation, as trustee under the Indenture referred to below (the “Trustee”). 
 W I T N E S S E T H 
 WHEREAS, the Issuer, the Parent Guarantor, the Subsidiary Guarantors and the Trustee have heretofore executed and delivered the Indenture and the Issuer
has issued pursuant to the Indenture the Issuer’s Senior Floating Rate Notes due 2013 (the “Notes”), in the aggregate amount of U.S.$200,000,000; 
 WHEREAS, the Issuer, the Parent Guarantor and Vernon Merger Corporation (“Merger Sub”), a wholly-owned subsidiary of Sirius Satellite Radio Inc., a Delaware corporation (“Sirius”), entered into the
Agreement and Plan of Merger, dated as of February 19, 2007 (the “Merger Agreement”) pursuant to which (i) Merger Sub will merge with and into the Parent Guarantor with the Parent Guarantor continuing as the surviving corporation
(the “Merger”); and (ii) each issued and outstanding share of common stock, par value $0.01 per share, of the Parent Guarantor outstanding immediately prior to the Effective Time (as defined below), shall be converted into the right
to receive, and shall become exchangeable in accordance with the Merger Agreement for, 4.6 shares of common stock, par value $0.001 per share, of Sirius; 
 WHEREAS, pursuant to Section 9.01 of the Indenture, the Issuer and the Trustee may amend or supplement the Indenture without the consent of any Holder of the Notes to make any change that does not adversely
affect the legal rights under the Indenture of any Holder of the Notes, including to provide for the assumption of the Issuer’s or any Guarantor’ obligations to the holders of the Notes by a successor thereto; 
 WHEREAS, the Issuer, the Parent Guarantor, the Subsidiary Guarantors and the Trustee have determined to enter into this First Supplemental Indenture for
the purpose of providing that the Parent Guarantor, as successor in the Merger, confirms its obligations as a Guarantor under the Indenture, its Indenture Guarantee and the Registration Rights Agreement on the terms set forth therein, and;

 WHEREAS, the Issuer has delivered to the Trustee an Officer’s Certificate as well as an Opinion of Counsel pursuant to Sections 9.06,
10.04 and 12.05 of the Indenture to the effect that the execution and delivery of this First Supplemental Indenture by the Issuer, the Parent Guarantor and the Subsidiary Guarantors is authorized and permitted under the Indenture and that all
conditions precedent and covenants, if any, provided for in the Indenture relating to the execution and delivery of this First Supplemental Indenture to be complied with by the Issuer, the Parent Guarantor and the Subsidiary Guarantors have been
satisfied; 

 WHEREAS, all other acts and proceedings required by law, by the Indenture and by the charter documents of
the Issuer, the Parent Guarantor and the Subsidiary Guarantors to make this First Supplemental Indenture a valid and binding agreement for the purposes expressed herein, in accordance with its terms, have been duly done and performed. 
 NOW, THEREFORE, in consideration of the premises and the covenants and agreements contained herein, and for other good and valuable consideration the
receipt of which is hereby acknowledged, the Issuer, the Parent Guarantor, the Subsidiary Guarantors and the Trustee hereby agree as follows: 
 ARTICLE 1 
 RATIFICATION; DEFINITIONS 
 Section 1.01. First Supplemental Indenture. This First Supplemental Indenture is supplemental to, and is entered into in accordance with Section 9.01 of, the Indenture, and except as modified, amended
and supplemented by this First Supplemental Indenture, the provisions of the Indenture are in all respects ratified and confirmed and shall remain in full force and effect. 
 Section 1.02. Definitions. Unless the context shall otherwise require, all terms which are defined in Section 1.01 of the Indenture
shall have the same meanings, respectively, in this First Supplemental Indenture as such terms are given in said Section 1.01 of the Indenture. 
 ARTICLE 2 
 CONFIRMATION OF GUARANTEE 
 Section 2.01. Confirmation of Guarantee. The Parent Guarantor, as successor in the Merger, hereby expressly confirms its obligations as Guarantor of the Issuer’s obligations under the Indenture, this
First Supplemental Indenture and the Notes. 
 ARTICLE 3 
 MISCELLANEOUS 
 Section 3.01. Effective Date. This First Supplemental Indenture shall become
effective as of the date hereof. 
 Section 3.02. Counterparts. This First Supplemental Indenture may be executed in several
counterparts, each of which shall be an original and all of which shall constitute but one and the same instrument. 
 Section 3.03.
Acceptance. The Trustee accepts the Indenture, as supplemented by this First Supplemental Indenture, and agrees to perform the same upon the terms and conditions set forth therein as so supplemented. The Trustee shall not be responsible in
any manner whatsoever for or in respect of the validity or sufficiency of this First Supplemental Indenture of the due execution by the Issuer, the Parent Guarantor or the Subsidiary Guarantors, or for or in respect of the recitals contained herein,
all of which are made solely by the Issuer, the Parent Guarantor or the Subsidiary Guarantors. 

 Section 3.04. Successors and Assigns. All covenants and agreements in this First Supplemental
Indenture by the Issuer, the Parent Guarantor or the Subsidiary Guarantors or the Trustee shall bind their respective successors and assigns, whether so expressed or not. 
 Section 3.05. Severability. In case any provision in this First Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions
shall not in any way be affected or impaired thereby. 
 Section 3.06. Governing Law. This First Supplemental Indenture shall be
governed by and construed in accordance with the laws of the State of New York. 
 Section 3.07. Incorporation into Indenture.
All provisions of this First Supplemental Indenture shall be deemed to be incorporated in, and made a part of, the Indenture; and the Indenture, as amended and supplemented by this First Supplemental Indenture, shall be read, taken and construed as
one and the same instrument. 

 IN WITNESS WHEREOF, the parties hereto have caused this First Supplemental Indenture to be duly executed,
all as of the day and year first above written. 
  

			
	The Issuer:
	
	XM SATELLITE RADIO INC.
		
	By	 	 /s/ Joseph J. Euteneuer

	Name:	 	Joseph J. Euteneuer
	Title:	 	Executive Vice President and Chief Financial Officer
	
	The Parent Guarantor:
	
	XM SATELLITE RADIO HOLDINGS INC.
		
	By	 	 /s/ Joseph J. Euteneuer

	Name:	 	Joseph J. Euteneuer
	Title:	 	Executive Vice President and Chief Financial Officer
	
	The Subsidiary Guarantors:
	
	XM EQUIPMENT LEASING LLC
		
		 	 /s/ Joseph J. Euteneuer

	Name:	 	Joseph J. Euteneuer
	Title:	 	Executive Vice President and Chief Financial Officer
	
	XM RADIO INC.
		
	By	 	 /s/ Joseph J. Euteneuer

	Name:	 	Joseph J. Euteneuer
	Title:	 	Executive Vice President and Chief Financial Officer

 [Senior Floating Rate Notes - First Supplemental Indenture] 

			
	The Trustee:
	
	THE BANK OF NEW YORK
		
	By	 	 /s/ Remo J. Reale

	Name:	 	Remo J. Reale
	Title:	 	Vice President

 [Senior Floating Rate Notes - First Supplemental Indenture]Exhibit 4.75

 Exhibit 4.75 
 [XM Letterhead] 
 July 28, 2008 
 Will Brett 
 Bank of America Tower 
 One Bryant Park 
 New York, NY 10036 
 Dear
Mr. Brett:
 Reference is made to (i) the Amended and Restated Note Purchase Agreement, dated as of June 16, 2003 (the
“Note Purchase Agreement”), by and among XM Satellite Radio Inc., a Delaware corporation, XM Satellite Radio Holdings Inc., a Delaware corporation (“XM Holdings”), and the investors named therein, and (ii) the
10% Senior Secured Discount Convertible Notes due 2009 (the “Notes”). Capitalized terms used but not defined herein shall have the meanings set forth in the Note Purchase Agreement. 
 Pursuant to the Agreement and Plan of Merger, dated as of February 19, 2007 (the “Merger Agreement”) by and among Sirius Satellite Radio
Inc., a Delaware corporation (“Sirius”), Vernon Merger Corporation, a Delaware corporation and direct wholly-owned subsidiary of Sirius (“Merger Co.”) and XM Holdings. Merger Co. merged with and into XM Holdings, with XM Holdings
as the surviving corporation on July 28, 2008 (the “Merger”). By virtue of the Merger, each share of XM Holdings Class A common stock outstanding at the time of the Merger was converted the right to receive 4.60 shares of
Sirius common stock, par value $0.001 per share. 
 Pursuant to Section 9.5 and Section 9.6 of the Note Purchase Agreement, XM
hereby confirms its obligation to deliver or cause to be delivered shares of Sirius common stock, par value $.001 per share, upon Conversion of the Notes pursuant to the terms of the Note Purchase Agreement. 

 Sincerely, 
  

			
	XM SATELLITE RADIO HOLDINGS INC.
		
	By:	 	 /s/ Joseph M. Titlebaum

	Name:	 	Joseph M. Titlebaum
	Title:	 	General Counsel and Secretary

 [10% Senior Secured Discount Convertible Notes]Exhibit 4.76

 Exhibit 4.76 
 CONFIRMATION OF ASSUMPTION 
 This CONFIRMATION OF ASSUMPTION (this “Confirmation”)
is made as of the 28th day of July, 2008 by XM Satellite Radio Holdings Inc., a Delaware corporation (“Holdings”). 
 WHEREAS, Holdings, Sirius Satellite Radio Inc., a Delaware corporation (“Sirius”), and Vernon Merger Corporation, a Delaware corporation and a direct wholly-owned subsidiary of Sirius (“Vernon”) are parties
to that certain Agreement and Plan of Merger, dated as of February 19, 2007, pursuant to which Vernon merged with and into Holdings on the date hereof (the “Merger”); and 
 WHEREAS, pursuant to Section 10(b) of the Guaranty, dated as of February 13, 2007 (the “Guaranty”), by Holdings, XM Radio
Inc., a Delaware corporation and a wholly owned subsidiary of Holdings, and XM Equipment Leasing, LLC, a Delaware limited liability company and a wholly owned subsidiary of Holdings (each a “Guarantor”), the successor entity to a
merger involving a Guarantor is required to expressly assume in writing the due and punctual payment of all obligations of such Guarantor under the Guaranty. 
 NOW, THEREFORE, in consideration of the premises and the mutual covenants and agreements set forth in the Guaranty and hereinafter set forth, the receipt and sufficiency of which is hereby acknowledged, Holdings,
intending to be legally bound, hereby agrees as follows: 
 1. Holdings, as the surviving entity in the Merger, hereby acknowledges and
confirms that the Guaranty continues to remain fully binding and enforceable against Holdings, and (for the avoidance of doubt) effective as of the consummation of the Merger unconditionally and irrevocably assumes the due and punctual payment and
performance of all obligations of Holdings under the Guaranty. 
 2. This Confirmation shall be governed by, and construed in accordance
with, the laws of the State of New York. 
  

			
	XM SATELLITE RADIO HOLDINGS INC.
		
	By:	 	 Joseph M. Titlebaum

	Name:	 	Joseph M. Titlebaum
	Title:	 	General Counsel and Secretary

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