Johnny Cash - folsom prison blues live at folsom state prison, 1968

"While his live At Folsom Prison album and performance is one of Cash's most well-known, it wasn't the only penitentiary where Cash played for inmates during his career. Cash played San Quentin State Prison in 1958, which included amongst its audience, Merle Haggard. Haggard was inspired by the concert and post his release, went on to pursue music of his own. During the show, Cash performed the song "San Quentin," about an inmate's hatred of prison. The song received such an enthusiastic response from the audience that Cash immediately played an encore."