Outside Lands Music and Arts Festival 2011 Pictures

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This past weekend was the fourth annual Outside Lands Music and Arts Festival, and we made it out to Golden Gate Park in San Francisco to see acts like Phish, the Black Keys, Girl Talk, and Arcade Fire. The three-day concert brought out tons of other musicians as well, and even if you didn't make it to SF to check it out, we've compiled 20 of some of the coolest pics from the fest for your viewing pleasure.