FILE - This May 6, 2012 file photo shows audience members dancing the 'Sissy Bounce' during the 'Bounce Shakedown' at the New Orleans Jazz and Heritage Festival in New Orleans. 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/Gerald Herbert, file)

Associated Press
FILE - This May 6, 2012 file photo shows audience members dancing the 'Sissy Bounce' during the 'Bounce Shakedown' at the New Orleans Jazz and Heritage Festival in New Orleans. 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/Gerald Herbert, file)
FILE - This May 6, 2012 file photo shows audience members dancing the 'Sissy Bounce' during the 'Bounce Shakedown' at the New Orleans Jazz and Heritage Festival in New Orleans. 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/Gerald Herbert, file)
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