Eric Clapton will headline Saturday, June 28th at Hard Rock Calling 2008 in London's Hyde Park, with special guests Sheryl Crow and John Mayer. The Police will headline Sunday, June 29th, accompanied by special guests KT Tunstall and Starsailor. Live Nation's VP Toby Leighton-Pope expressed excitement about the legendary headliners continuing the tradition of major artists at the historic musical event, which will feature two stages and surprises over the two days.