`Idol Gives Back' promises Bill Gates surprise

FILE - In this Jan. 30, 2009 file photo, co-chairs of the Bill and Melinda Gates Foundation, USA, Bill Gates, right, and Melinda Gates, sit together prior to an interview at the World Economic Forum in Davos, Switzerland. Associated Press

April 20, 2010 9:38:02 AM PDT
The entertainment magnate behind "American Idol" and the show's charity broadcast is touting a lineup that includes Elton John and Carrie Underwood.

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