Sheryl Crow wants your vote — and figures she can get it for a song.

The Grammy Award-winning singer is offering a free download of her politically charged tune "Gasoline" to anyone who logs onto the Rock the Vote Web site or anyone on the group's mailing list.

And the first 50,000 people who register three friends to vote will get a free digital copy of her album "Detours."

Crow's giveaway is a kickoff to Rock the Vote's voter registration drive, said the organization's executive director Heather Smith.

Crow, 46, was one of the founding artists of Rock the Vote 18 years ago.