Ok...
Moody Blues (1971)
Chicago (1972)
Yes (1972) and about 30 times since LOL
The Guess Who (1973)
Styx (1973)
Beach Boys (1973)
ELP (1974-ish)
Procol Harem (Backed by Frampton's Camel) 1973
Poco (1973)
America (1973)
Edgar Winter (1973)
Humble Pie (1974)
J. Geiles Band (1974)
Hawkwind (1974)
Dave Mason (1974-ish)
Fleetwood Mack (1974?)
Traffic (1974?)
Aerosmith and Blue Oyster Cult (1974)
Wishbone Ash (1974?) They were backed by Blue Oyster Cult and Renaissance
Black Oak Arkansas (1974)
Wishbone Ash (again) - (1974)
The Doobie Brothers (1974)
Led Zeppelin (1975)
Deodato (1975)
Jethro Tull (1975?)
Mountain/Brownsville Station/Montrose (1975)
Dave Mason (1975)
Jethro Tull - again (1975)
Kansas/Rory Gallagher/Canned Heat (1976)
Robin Trower (1977)
Emerson, Lake, Palmer (1977)
Herbie Hancock (1977)
Heart (1978)
Dave Mason – again (1978)
Greatful Dead (1978)
Eric Clapton – Backed by Muddy Watters (1979)
Chuck Mangione (1979)
Preservation Hall Jazz Band (1980)
Jimmy Buffet (1980)
Willie Nelson (1980)
Memphis Caravan Blues Band (1980)
Heart –again (1980)
Jack DejhonetteÂ’s Special Edition (1980?)
Leo Kottke backed by Leon Redbone (1980?)
Fleetwood Mac (1980)
Marshall Tucker Band (1980)
Jose Feliciano (1981)
Moody Blues (1981)
The Police (1983)
Leonard Rose (1984)
Peter Gabriel (1986)
Heart (1987)
Anne Murray – twice – only because the made me go 
B-52Â’s (1989)
Les Miserables (1991)
Dire Straits (1992)
Steve Miller (1992)
The Black Crowes (1993)
Miss Saigon (1993)
James Taylor (1993)
Concrete Blonde (1993)
Mannheim Steamroller (1996)
AC/DC (1996)
Bush (backed by Goo Goo Dolls) 1996
Smashing Pumpkins – Backed by No Doubt (1996)
Steve Miller Band (1998)
Shawn Colvin (1998)
Jimmy Page/Robert Plant (1998)
Jeff Beck (1999)
Blondie (1999)
CSNY (2000)
Moody Blues (2000)
U2 (2001)
Aerosmith (2001)
TO BE CONTINUEDÂ….