FILE - In this March 12, 2012 file photo, guitarist/vocalist Dan Auerbach of The Black Keys performs at Madison Square Garden in New York.  The Black Keys, Jack White and more than 30 other acts will hit the stage for the Firefly Music Festival at the Woodlands of Dover International Speedway in Delaware. The two-day festival kicks off July 20 through July 22, and also features John Legend, Death Cab for Cutie and Lupe Fiasco. (AP Photo/Evan Agostini, File)