Derek and the Dominos, Carl Perkins & Johnny Cash - "It's Too Late" & "Matchbox"

Recorded for The Johnny Cash Show on November 5, 1970, featuring Eric Clapton (guitar, vocals), Bobby Whitlock (keyboards, vocals), Carl Radle (bass), and Jim Gordon (drums), with Carl Perkins (guitar, vocal) and Johnny Cash (guitar, vocal).

Derek and the Dominos on Wikipedia Eric Clapton official site