Marcus Mumford performs a tribute to Levon Helm at the 55th annual Grammy Awards on Sunday, Feb. 10, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)

Associated Press
Marcus Mumford performs a tribute to Levon Helm at the 55th annual Grammy Awards on Sunday, Feb. 10, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)
Marcus Mumford performs a tribute to Levon Helm at the 55th annual Grammy Awards on Sunday, Feb. 10, 2013, in Los Angeles. (Photo by John Shearer/Invision/AP)
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