EXHIBIT 21.1

SIRIUS XM RADIO INC. AND SUBSIDIARIES
Subsidiaries

     
Satellite CD Radio, Inc.
  State of Delaware
Sirius Asset Management Company LLC
  State of Delaware
Sirius Entertainment Promotions LLC
  State of Delaware
Spend LLC
  State of Maryland
Earth Station Ecuador Cia. Ltda.
  Quito, Ecuador
XM Satellite Radio Holdings Inc.
  State of Delaware
XM Satellite Radio Inc.
  State of Delaware
XM Equipment Leasing LLC
  State of Delaware
XM EMall Inc.
  State of Delaware
XM Radio Inc.
  State of Delaware
XM Innovations Inc.
  State of Delaware
XM Capital Resources Inc.
  State of Delaware
XM 1500 Eckington LLC
  State of Delaware
XM Investment LLC
  State of Delaware
Effanel Music, Inc.
  State of New York
Interoperable Technologies LLC
  State of Delaware
Satellite Public Radio Inc.
  Washington, D.C.