Merle Haggard, center, performs with Vince Gill, left, and Keith Urban, right, during the All for the Hall concert on Tuesday, April 10, 2012, in Nashville, Tenn. The concert is a benefit for the Country Music Hall of Fame and Museum. (AP Photo/Mark Humphrey)

Associated Press
Merle Haggard, center, performs with Vince Gill, left, and Keith Urban, right, during the All for the Hall concert on Tuesday, April 10, 2012, in Nashville, Tenn. The concert is a benefit for the Country Music Hall of Fame and Museum. (AP Photo/Mark Humphrey)
Merle Haggard, center, performs with Vince Gill, left, and Keith Urban, right, during the All for the Hall concert on Tuesday, April 10, 2012, in Nashville, Tenn. The concert is a benefit for the Country Music Hall of Fame and Museum. (AP Photo/Mark Humphrey)
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