Unchained is the second album in Johnny Cash's American Recording series (and his 82nd overall). Like all Cash's albums for American, Unchained was produced by Rick Rubin. On the album, Cash is backed by Tom Petty and the Heartbreakers as well as a guest appearance of Flea, bassist from Red Hot Chili Peppers, on "Spiritual", and Lindsey Buckingham and Mick Fleetwood, both of Fleetwood Mac, on "Sea of Heartbreak". Unchained focuses more on covers and less on original material than the first album in the series. In addition to three of Cash's own compositions, Unchained contained songs by Tom Petty ("Southern Accents"), Soundgarden ("Rusty Cage") and Beck ("Rowboat"), The album also included a cover of the classic 1962 Hank Snow song, "I've Been Everywhere", written by Geoff Mack. In comparison with the country folk sound of Cash's other American Recordings' albums this one has more of a hard, true country rock sound.