Zac Brown, left, and Mavis Staples perform "My City of Ruins" on 

Zac Brown, left, and Mavis Staples perform "My City of Ruins" on stage at the MusiCares Person of the Year tribute honoring Bruce Springsteen at the Los Angeles Convention Center on Friday Feb. 8, 2013, in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
Associated Press
Zac Brown, left, and Mavis Staples perform "My City of Ruins" on stage at the MusiCares Person of the Year tribute honoring Bruce Springsteen at the Los Angeles Convention Center on Friday Feb. 8, 2013, in Los Angeles. (Photo by Chris Pizzello/Invision/AP)
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