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(MANDATORY CREDIT Ebet Roberts/Getty Images) Willie Nelson performing at the Farm Aid Concert at Miller Park on 2nd October 2010 in Milwaukee, Wisconsin, United States. (Photo by Ebet Roberts/Redferns)

(MANDATORY CREDIT Ebet Roberts/Getty Images) Willie Nelson performing at the Farm Aid Concert at Miller Park on 2nd October 2010 in Milwaukee, Wisconsin, United States. (Photo by Ebet Roberts/Redferns)