Johnny Cash was surely one of the world's most legendary musicians and yeah we all got to know him pretty well through Joaquin Phoenix's version of him in 'Walk the Line', but this musical documentary from 1969 by Robert Elfstrom gives a rare sneak peak of the singer at the height of his career. You can see him performing with his new bride June Carter Cash, as well as in a rare duet with Bob Dylan, which is enough to watch in itself really.