Photo of folk singer Woody Guthrie playing his guitar while a cigarette dangles from his lips. Ca. 1960s. (Photo by �� John Springer Collection/CORBIS/Corbis via Getty Images)
Bob Dylan poses for a portrait to promote the release of his album 'The Times They Are A-Changin'' in January 1964. (Photo by Michael Ochs Archives/Getty Images)
NEW YORK – JANUARY 13-15: Bob Dylan plays a Fender Stratocaster electric guitar through an Ampeg amplifier while recording his album 'Bringing It All Back Home' on January 13-15, 1965 in Columbia's Studio A in New York City, New York. (Photo by Michael Ochs Archives/Getty Images)
BERKELEY, CA – MARCH 1: Joni Mitchell performs at the Community Center in Berkeley, California on March 1, 1974. (Photo by Larry Hulst/Michael Ochs Archives/Getty Images)
