The 1969 Bob Dylan-Johnny Cash Sessions: Twelve Rare Recordings

"Bob Dylan and Johnny Cash had formed a mutual admiration society even before they met in the early 1960s. 'Of course, I knew of him before he ever heard of me,' Dylan wrote shortly after Cash’s death in 2003. 'In ’55 or ’56, I Walk the Line played all summer on the radio, and it was different than anything else you had ever heard. The record sounded like a voice from the middle of the Earth. It was so powerful and moving.' When the young Dylan arrived on the scene in 1962, Cash was impressed."
The 1969 Bob Dylan-Johnny Cash Sessions: Twelve Rare Recordings (YouTube)