AUSTIN, TX – APRIL 20: Musician Ronnie Dunn performs during the "We Walk The Line: A Celebration Of The Music Of Johnny Cash" show at ACL Live on April 20, 2012 in Austin, Texas. (Photo by Gary Miller/FilmMagic)
Kris Kristofferson and Vince Gill during 2003 BMI Country Music Awards at BMI Nashville in Nashville, Tennessee, United States. (Photo by Frank Mullen/WireImage)
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 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)
