Chicago's Grant Park will be the place to be August 5-7. Celebrating 20 years, Lollapalooza is still one of the premier festivals in the country, gathering some of the biggest and brightest stars in alternative, rock, pop, hip-hop and electronic music. Get a taste of the 2011 lineup here, including headliners Eminem, Foo Fighters, Coldplay and Muse, along with booty-shaking acts from Girl Talk to Kid Cudi.