American musician 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)(CBS Photo Archive)