""Killing Floor" is an upbeat twelve-bar blues with an "instantly familiar" guitar riff provided by Sumlin.Backing Howlin' Wolf (vocals) and Sumlin (electric guitar) are Lafayette Leake (piano), Buddy Guy (acoustic guitar), Andrew "Blueblood" McMahon (bass), Sam Lay (drums), Arnold Rogers (tenor sax), and Donald Hankins (baritone sax).