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)
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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