FILE - In this Feb. 6, 2013 file photo, lead singer Marcus 

FILE - In this Feb. 6, 2013 file photo, lead singer Marcus Mumford performs with Mumford & Sons during a concert at the Barclays Center in New York. Mumford and Sons will be one of the headliners at the Lollapalooza music festival in Chicago's Grant Park in August 2013. (Photo by Jason DeCrow/Invision/AP)
Associated Press
FILE - In this Feb. 6, 2013 file photo, lead singer Marcus Mumford performs with Mumford & Sons during a concert at the Barclays Center in New York. Mumford and Sons will be one of the headliners at the Lollapalooza music festival in Chicago's Grant Park in August 2013. (Photo by Jason DeCrow/Invision/AP)
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