Well, here goes my list by memory, so I might miss some. I'll try and get them in some sort of chronological order too.
Andy Williams and the Osmond Family(it gets better, don't worry)
Bread
Jethrol Tull and Yes
Three Dog Night
Chicago
Grand Funk Railroad and Bloodrock
Slade
Humble Pie and Montrose
James Gang
Rare Earth
Led Zepplin(twice)
Tower of Power(three times)
John Mayhal
Buddy Miles
Brownsville Station
Edgar Winter
Black Oak Arkansas
Sugarloaf
Stevie Wonder
Chaka Kahn
George Benson
John Klemmer
Merrilee Rush
Eric Clapton
Santana
Robin Trower
Sam and Dave
Bonnie Rait
Stevie Ray Vaughn(three times)
Joe Cocker
Robert Cray(numerous times)
Rod Stewart and Jeff Beck
Sting and Anne Lennox
Fleetwood Mac
Eagles
Blood, Sweat and Tears
Rascals
B.B. King
Albert King
Al Dimeola
Buckwheat Zydeco
Jerry Miller(one of the founding members of Moby Grape)
Albert Collins(played at my high school graduation)
Well, that's all I can remember. Good luck remembering all of yours.