I been to a ton, but usually bands no ones ever heard of. A few notables.

Deftones
NOFX
Rancid
Sonic Youth
Ziggy Marley
Rage Against The Machine
Jane's Addiction
Audioslave
Jedi Mind Tricks
The Wailers
Method Man
Israel Vibration
Jedi Mind Tricks
Ghostface Killah
Big Daddy Kane
Willie Nelson
Yonder Mountain String Band
Coldplay
Crystal Method
Prodigy