Bob Dylan (born Robert Zimmerman) performs 'Talkin' John Birch Paranoid Blues' during rehearsals for an apperance on the Ed Sullivan Show, New York, New York, May 12, 1963. After the rehearsal, Dylan was asked to perform a different song for the broadcast, a request he refused; he walked out of the studio and never appeared on the broadcast. (Photo by CBS Photo Archive/Getty Images)
LOS ANGELES – JUNE 11: "The Ed Sullivan Show", featuring The Mamas And The Papas. (From left) Michelle Phillips, 'Mama' Cass Elliot, Denny Doherty and John Phillips on June 11, 1967. (Photo by CBS via Getty Images)
Portrait of American Folk, Pop, & Rock musician Neil Young, of the group Crosby, Stills, Nash, & Young, as he poses in a studio, September 18, 1969. (Photo by Jack Robinson/Hulton Archive/Getty Images)
American pop group The Byrds at London Airport, where they flew in for a 16-day tour. (l-r) Mike Clarke, Chris Hillman, David Crosby, Jim McGuinn and Gene Clark. (Photo by PA Images via Getty Images)
Bob Dylan plays a Fender Stratocaster electric guitar for the first time on stage as he performs at the Newport Folk Festival with guitarist Mike Bloomfield on July 25, 1965 in Newport, Rhode Island. (Photo by Alice Ochs/Michael Ochs Archives/Getty Images)
