Sheryl Crow joins Stewart, Colbert rally

Sheryl Crow has reportedly signed to perform at Jon Stewart and Stephen Colbert's Rally to Restore Sanity and/or Fear.

According to the Christian Science Monitor, The Roots will kick off the event with a 40-minute show, which takes place on Saturday in Washington DC.

Jeff Tweedy of the band Wilco has agreed to play a ten-minute set, and Crow will also take the stage in the afternoon.

Law & Order star Sam Waterston and Mavis Staples will further appear. More guests and artists are expected to be announced.