Bob Dylan Recorded "Ring of Fire" with Johnny Cash as a duet on Feb 17 or 18,1969 (Cash wrote the song and had a hit with it in 1963 on Columbia) the whole session was scrapped and not released (except for Girl from North Country on Nashville Skyline) the rest of it has been issued on a Cd called The Dylan/Cash sessions (Spank SP 106) which includes Ring as well as 14 other duets from this session, Dylan's appearance on The Johnny Cash show - 3 songs and five remixes of N Skyline songs from the Columbia quad version. This cd (a bootleg) is not too dificult to come by, but prepare to pay 26 - 30 bucks when you do find it. If you have any real difficulties let me know and maybe Iccan help track it down..