Acoustic Guitar – Howlin' Wolf (tracks: B3, B4) Bass Guitar, Shaker, Cowbell [Cow-Bell] – Bill Wyman Drums – Richie* (tracks: A2) Drums, Congas, Percussion [Assorted] – Charlie Watts Harmonica – Howlin' Wolf (tracks: A4, B2), Jeffrey M. Carp Lead Guitar – Eric Clapton Piano – Ian Stewart (tracks: A1, B1, B3, B7) Piano, Organ – Steve Winwood Producer – Norman Dayron Rhythm Guitar – Hubert Sumlin Vocals – Howlin' Wolf