American folk singer and guitarist Richie Havens opening the Woodstock Festival at Bethel, New York, 15th August 1969. (Photo by Tucker Ranson/Archive Photos/Getty Images)
20th November 1968: Portrait of American musician Joni Mitchell seated on the floor with her acoustic guitar in her lap. This image was from a shoot for the fashion magazine Vogue. Mitchell wears a white cotton dress. (Photo by Jack Robinson/Hulton Archive/Getty Images)
ATLANTA – NOVEMBER 12: Singer-songwriter John Prine hangs out with his guitar in an apartment on Briarcliff Road on November 12, 1975 in Atlanta, Georgia. (Photo by Tom Hill/Getty Images)
American popular music duo Simon and Garfunkel, who are singer (and later actor) Art Garfunkel and guitarist and singer Paul Simon, performs on the CBS variety program 'The Ed Sullivan Show,' New York, May 22, 1966. (Photo by CBS Photo Archive/Getty Images)