2011 Virgin Mobile Freefest lineup [Pictures]
Six years ago, the Virgin Mobile Fest began as a ticketed event with A-list headliners at Pimlico Race Course. It later moved to Merriweather Post Pavilion, became a free festival and started booking more up-and-coming acts. Here's the rundown of this year's lineup, which features 20 bands performing on three stages. Tickets become available at 10 a.m. July 15 via Facebook.
• Midnight Sun: Virgin Mobile Freefest coverage
• 2011 Virgin Mobile FreeFest Guide
• Pictures: Virgin Festivals through the years
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The Black Keys( AFP/Getty Images / July 6, 2011 )
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"