Exhibit 32.1


                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

          In connection with the Quarterly Report of Sirius Satellite Radio Inc.
(the "Company") on Form 10-Q for the period ending June 30, 2004 as filed with
the Securities and Exchange Commission on the date hereof (the "Report"), I,
Joseph P. Clayton, Chief Executive Officer of the Company, certify, pursuant to
18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that:

          (1) The Report fully complies with the requirements of Section 13(a)
or 15(d) of the Securities Exchange Act of 1934; and

          (2) The information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company.


                                               By: /s/ JOSEPH P. CLAYTON
                                                   -----------------------------
                                                   Joseph P. Clayton
                                                   Chief Executive Officer
                                                   (Principal Executive Officer)

August 9, 2004


          A signed original of this written statement required by Section 906,
or other document authenticating, acknowledging, or otherwise adopting the
signature that appears in typed form within the electronic version of this
written statement required by Section 906, has been provided to the Company and
will be retained by the Company and furnished to the Securities and Exchange
Commission or its staff upon request.