Members of the crowd watch The Black Keys, unseen, play at Lollapalooza 

Members of the crowd watch The Black Keys, unseen, play at Lollapalooza in Chicago's Grant Park on Friday, Aug. 3, 2012. (Photo by Sitthixay Ditthavong/Invision/AP)
Associated Press
Members of the crowd watch The Black Keys, unseen, play at Lollapalooza in Chicago's Grant Park on Friday, Aug. 3, 2012. (Photo by Sitthixay Ditthavong/Invision/AP)
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