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

Delaney & Bonnie & Friends - Live in Copenhagen

Recorded December 10, 1969 in Copehagen, Denmark, featuring Bonnie Bramlett (vocals), Delaney Bramlett (vocals, guitar), Eric Clapton (guitar, vocals), George Harrison (guitar), Carl Radle (bass), Jim Gordon (drums), Bobby Whitlock (keyboards, vocals), Billy Preston (organ), Jim Price (trumpet), Bobby Keys (tenor sax), Rita Coolidge (vocals), and Tex Johnson (percussion).

Bonnie Bramlett official site
Delaney Bramlett on Wikipedia