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)
HONOLULU, HI – MARCH 25: Rock and roll singer Elvis Presley performs on stage at Bloch Arena on March 25, 1961 in Honolulu, Hawaii. (Photo by Michael Ochs Archives/Getty Images)
(MANDATORY CREDIT Koh Hasebe/Shinko Music/Getty Images) Carlos Santana of Santana performs on stage at Kyuden-Memorial gymnasium during the band's first tour of Japan, Fukuoka, Japan, 26th June 1973. (Photo by Koh Hasebe/Shinko Music/Getty Images)
