BOSTON, MA - MAY 10: (L-R) Willie Nelson and Kris Kristofferson perform during the 2013 Berklee College Of Music Commencement Concert at Berklee College of Music on May 10, 2013 in Boston, ... more 
BOSTON, MA - MAY 10: (L-R) Willie Nelson and Kris Kristofferson perform during the 2013 Berklee College Of Music Commencement Concert at Berklee College of Music on May 10, 2013 in Boston, Massachusetts. (Photo by Paul Marotta/Getty Images) less 
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Getty Images | Photo By Paul Marotta / Getty Images
Sat, May 11, 2013 12:57 AM EDT