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.