Johnny Cash sings 'Folsom Prison Blues', 'The Wall', 'Greystone Chapel' & 'It Ain't Me, Babe' (with June Carter Cash). Bob Dylan sings 'I Threw it All Away' and 'Livin' the Blues'; Joni Mitchell sings 'Both Sides Now'; Doug Kershaw sings 'Diggy, Liggy Lo'; Johnny & Bob Dylan duet on 'Girl from the North Country'.