Sheryl Crow performs at the Mann Center for the Performing Arts, in this August 2, 2008 file photo, in Philadelphia. As part of a Rock the Vote voter registration drive, singer-songwriter Crow will give away 50,000 digital copies of her latest album, "Detours," for free to anyone who registers three friends to vote_ a tactic she calls the "Tupperware" party approach to inspiring young people to vote. AP Photo logo AP Photo 15 months ago

Sheryl Crow performs at the Mann Center for the Performing Arts, in this August 2, 2008 file photo, in Philadelphia. As part of a Rock the Vote voter registration drive, singer-songwriter Crow will give away 50,000 digital copies of her latest album, "Detours," for free to anyone who registers three friends to vote_ a tactic she calls the "Tupperware" party approach to inspiring young people to vote.