2011 Virgin Mobile Freefest lineup
Essential facts: Ohio natives Dan Auerbach and Patrick Carney started out as a blues-rock duo, but increasingly they have been weaving hip-hop and R&B elements into their gritty sound. At this year's Grammys, the band won three awards including Best Alternative Music Album. Current album: "Brothers" (2010) Biggest single: "Tighten Up" (AFP/Getty Images)