Pink Floyd
The Who
Page and Plant
Roger Waters
Iron Maiden
Jeff Beck
Santana
Scorpions
Judas Priest
Kiss
Aerosmith
Deep Purple (reunion tour w/the classic lineup)
Bad Company
The Temptations
Van Halen
Sammy Hagar
U2
B.B. King
Robin Trower
Galactic
G3: Steve Vai/John Petrucci/Joe Satriani
Pat Metheny
Dokken
Fats Domino
Dream Theater
Los Hombres Calientes
Wynton Marsalis and The Jazz at Lincoln Center Orchestra
Ellis Marsalis
Charmaine Neville
Neville Brothers
Twisted Sister
Yngwie Malmsteen
Stone Temple Pilots
Dizzie Gillespie
Irvin Mayfield
...and too many jazz greats in New Orleans to remember
Also, a ton of classical orchestras and soloists from all over the world, with the Royal Concertgebouw Orchestra of Amsterdam

(considered by many to be the world's greatest orchestra) at or near the top of the list!
Turn off your mind, relax and float downstream. - John Lennon