American singer-songwriter and actor Kris Kristofferson, wearing a white v-neck top, playing an acoustic guitar as he performs live at the Schaefer Music Festival, held at the Wollman Rink in Central Park in New York City, New York, 9th August 1971. (Photo by Don Paulsen/Michael Ochs Archives/Getty Images)
Bob Dylan and Johnny Cash perform together with acoustic guitars on 'The Johnny Cash Show' on June 7, 1969 in Nashville, Tennessee. (Photo by Michael Ochs Archives/Getty Images)
SEPTEMBER 1969: Married country singers Johnny Cash & June Carter Cash pose for a portrait at an event in September 1969 in California. (Photo by Michael Ochs Archives/Getty Images)
American country singer Johnny Cash (1932 – 2003) sits with an acoustic guitar in a still from the film, 'Road To Nashville,' directed by Will Zenz, 1966. (Photo by Hulton Archive/Getty Images)
UNITED KINGDOM – APRIL 01: Photo of John DENVER; performing on 'The John Denver Show' BBC TV show – MusicBrainz: 34e10b51-b5c6-4bc1-b70e-f05f141eda1e, (Photo by Tony Russell/Redferns)
