Promotional studio portrait of American country singer and songwriter George Jones with an acoustic guitar, circa 1970. (Photo by Hulton Archive/Getty Images)
American country singer and songwriter Johnny Cash (1932 – 2003) plays acoustic guitar in a still from his television variety series, 'The Johnny Cash Show,' circa 1968. (Photo by Hulton Archive/Getty Images)
NEW YORK, N.Y. – September 30, 1968: Grace Slick and Paul Kantner of Jefferson Airplane in Concert in Central Park for a free concert on September 30, 1968 in New York, New York.. (Photo by MediaPunch/Shutterstock)
