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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 and Kris Kristofferson perform during the 2013 Berklee College Of Music Commencement Concert at Berklee College of Music on May 10 in Boston.

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)

Berklee College of Music President Roger Brown, Lawrence Simpson and Kris Kristofferson confer an receive honorary doctor of music degree on Willie Nelson during the 2013 Berklee College Of Music Commencement at Berklee College of Music on May 11 in Boston.

Willie Nelson & Kris Kristofferson perform during 2013 Berklee College Of Music Commencement Concert at Berklee College of Music on May 10 in Boston. (Photo by Paul Marotta/Getty Images)

Berklee College of Music President Roger Brown, Lawrence Simpson and Kris Kristofferson confer an Honorary Doctor of Music Degree on WIllie Nelson 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 Ceremony at Berklee College of Music on May 11 in Boston.

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 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.