I'd give my left nut to be able to go back in time and be at the G3: Rockin' in the Free World concert. If you don't know that was basically Satriani/Vai/Malmsteen having a gigantic guitar face-off. I'm listening to the CD and my face is melting.
Ok here are the artists I've got so far. I'm probably forgetting some stuff, this is from the top of my head.
AC/DC
Aerosmith
Pink Floyd
Van Halen
Metallica
Joe Satriani
Steve Vai
Yngwie Malmsteen
Neil Young
Rush
Journey
Ozzy Osbourne
The Who
Jimmy Hendrix
ELO
Doobie Brothers
Queen
Yes