By the time Vampire Weekend took the stage -- just a little past 11 P.M. -- the crowd was exhausted. It had been a long, hot day, and the Wu Tang Clan's frenzied performance inspired so much jumping up and down that most remaining fans were experiencing a serious case of rubber legs. Lead singer Ezra Koenig must have noticed, because he thanked everyone for sticking out the heat, adding, "You know, dancing isn't required -- but it is recommended." Despite exhaustion, the audience acted on his suggestion, bopping halfheartedly at first, and then launching into full-out thrash mode by the time the first chords of "A-Punk" struck. Energetic performances of "Cousins," "Oxford Comma," and "Giving Up the Gun" were like a giant dose of caffeine, yanking the audience out of their sunburned funk and spinning them into motion. The band ended the set rather abruptly, though, after a high-speed version of "Walcott," sending the now-amped crowd towards Philly's Fluid nightclub, where Questlove was set to DJ the festival's official after-party.

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