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Willie Nelson receives an Honorary Doctor of Music Degree during the 2013 Berklee College Of Music Commencement Ceremony at Berklee College of Music on May 11, 2013 in Boston.

Willie Nelson receives an Honorary Doctor of Music Degree during the 2013 Berklee College Of Music Commencement Ceremony at Berklee College of Music on May 11 in Boston.

Willie Nelson receives an honorary doctor of music degree during the 2013 Berklee College Of Music Commencement at Berklee College of Music on May 11 in Boston.

Willie Nelson receives an honorary doctor of music degrees during the 2013 Berklee College Of Music Commencement at Berklee College of Music on May 11 in Boston.

Willie Nelson receives an honorary doctor of music degrees during the 2013 Berklee College Of Music Commencement at Berklee College of Music on May 11 in Boston. (Photo by Paul Marotta/Getty Images)

Willie Nelson and Carole King receive honorary doctor of music degrees during the 2013 Berklee College Of Music Commencement at Berklee College of Music on May 11 in Boston.

Willie Nelson performs during the 2013 Berklee College Of Music Commencement Concert at Berklee College of Music on May 10 in Boston.