FILE - This June 10, 2012 file photo shows fans during a performance by The Black Lips at the Bonnaroo Music and Arts Festival in Manchester, Tenn. Despite heat, humidity, crowds and costs, music festivals are more popular than ever, attracting millions of fans, with 270 festivals of various types annually in the U.S. and more than 800 in 57 countries. (AP Photo/Dave Martin, file)

Associated Press
FILE - This June 10, 2012 file photo shows fans during a performance by The Black Lips at the Bonnaroo Music and Arts Festival in Manchester, Tenn. Despite heat, humidity, crowds and costs, music festivals are more popular than ever, attracting millions of fans, with 270 festivals of various types annually in the U.S. and more than 800 in 57 countries. (AP Photo/Dave Martin, file)
FILE - This June 10, 2012 file photo shows fans during a performance by The Black Lips at the Bonnaroo Music and Arts Festival in Manchester, Tenn. Despite heat, humidity, crowds and costs, music festivals are more popular than ever, attracting millions of fans, with 270 festivals of various types annually in the U.S. and more than 800 in 57 countries. (AP Photo/Dave Martin, file)
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