OK... here is what I found doing some serious music searching:

All of these people have recorded SMB: Allman Brothers Band, B.B. King, Barbara Morrison, Ben James, Big Allanbik, Big Joe Turner, Billie Poole, Billy Eckstine, Bob Gaddy, Bobby Blue Bland, Bubbling Brown Sugar Cast Recording, Buddy Ace, Buddy Guy, Charles Brown, Chris Farlowe, Colosseum, Count Basie, Dadadah, David Menefee, Diane Schuur, Drink Small, Duke Robillard Band, Earl Hines, Earl Hooker, Eddie 'Cleanhead' Vinson, Eddy Clearwater, Elijah Levi/Tatsu Aoki Quartet, Eric Clapton, Freddie King, Gary Moore, Gene Ammons, Gene Harris/Jack McDuff, Gerry McGee, Gloria Lynne, GRP All-Star Big Band, Issac Hayes, Jackson 5, James "Son" Thomas, Jethro Tull, Jimmy Witherspoon, John Handy with Class, John Mayall's Bluesbreakers, Junior Wells, Kenny Burrell, Keymen, Kirk Detweiler, Latimore, Little Joe Cook, Long John Baldry, Lou Rawls, Manfred Mann, Memphis Minnie, Muddy Waters, Nancy Wilson, New York Unit, Oscar Klein, Otis Rush, Professor's Blues Revue, Rashied Ali/Royal Blue, Roomful of Blues, Rotary Connection, Shirley Scott, Smiley Lewis, Stefan Diestelmann, T-Bone Walker, The Astronauts, The McCoys, Touch, Van Broussard, Yoko Noge/Jazz Me Blues Band

Cripes!