FILE - This June 11, 2011 file photo shows music fans gathering to watch Wiz Khalifa during 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 11, 2011 file photo shows music fans gathering to watch Wiz Khalifa during 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 11, 2011 file photo shows music fans gathering to watch Wiz Khalifa during 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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