The Senate Commerce, Science and Transportation Committee hearing on the Sirius-XM merger is set to kick off today at 10am ET. The list of witnesses includes:

• Mel Karmazin
  Chief Executive Officer
  SIRIUS Satelite Radio
• W. Russell Withers Jr.
  President
  Withers Broadcasting Companies
• Gene Kimmelman
  Vice President for Federal and International Affairs
  Consumer Union
• Gigi B. Sohn
  President and Co-Founder
  Public Knowledge
• David Bank
  Managing Director-Equity Research
  RBC Capital Markets
  

A webcast should be available shortly (15 mins prior to the start of the hearing), or just come back later and read all about it here.