MAY 1 1986, JUN 4 1989, OCT 18 1991, NOV 2 1991, DEC 29 1991 John Cougar Mellencamp opened Denver performance with "Small Town," followed by Jack and Diane." Credit: The Denver Post (Denver Post via Getty Images)
CIRCA 1975: (L-R) Dougie Thomson, Bob C. Benberg John A. Helliwell, Roger Hodgson and Rick Davies of the rock band "Supertramp" pose for a portrait in circa 1975. (Photo by Michael Ochs Archives/Getty Images)
LONDON – MARCH 16: Richard & Linda Thompson performing at 'Over The Rainbow', a concert marking the first closure of The Rainbow Theatre, Finsbury Park, North London on March 16 1975 (Photo by Brian Cooke/Redferns)
AUSTIN, TEXAS – JULY 04: Merle Haggard (R) performs with Willie Nelson during Willie Nelson's 4th of July Picnic at the Spicewood Springs Amphitheater on July 4, 2003 in Austin, Texas. (Photo by Gary Miller/Getty Images)
Portrait of American music duo David & David as they pose at the Park West Theater, Chicago, Illinois, November 16, 1986. Pictured are David Baerwald (left) and David Ricketts. (Photo by Paul Natkin/Getty Images)
