FILE - This April 13, 2012 file photo shows festivalgoers running toward the main stage to catch the beginning of Kendrick Lamar's set during the first weekend of the 2012 Coachella Valley Music and Arts Festival in Indio, Calif. 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/Chris Pizzello, file)

Associated Press
FILE - This April 13, 2012 file photo shows festivalgoers running toward the main stage to catch the beginning of Kendrick Lamar's set during the first weekend of the 2012 Coachella Valley Music and Arts Festival in Indio, Calif. 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/Chris Pizzello, file)
FILE - This April 13, 2012 file photo shows festivalgoers running toward the main stage to catch the beginning of Kendrick Lamar's set during the first weekend of the 2012 Coachella Valley Music and Arts Festival in Indio, Calif. 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/Chris Pizzello, file)
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