Sonny Boy Williamson – Vocals / Harmonica
Eric Clapton – Lead Guitar
Keith Relf – Vocals / Harmonica
Chris Dreja – Rhythm Guitar
Paul Samwell-Smith – Bass
Jim McCarty – Drums
The Yardbirds backed Sonny Boy Williamson on a series of 12 gigs between 7 December 1963 and 13 March 1964. The Yardbirds would play a solo set, followed by the set with the American blues musician. Both sets on 8 December 1963 were recorded and released. Their set with Sonny Boy Williamson on 28 February 1964 was also recorded and released. The Yardbirds solo set was not captured that night due to technical difficulties.