Pantera
OLD Metallica
White Zombie
Slipknot
Black Sabbath
Mudvayne
Rock:
Nirvana
Led Zeppelin
Bush
Van Halen
Jimi Hendrix
Stevie Ray Vaughan
Tool
Perfect Circle
Live
While we're at it, I'll list some of the best guitarists in my opinion:
Jimi Hendrix
Van Halen
Stevie Ray Vaughan
Kirk Hammett
Zack Wylde
Steve Vai
Joe Satriani
Tony Iommi
DIMEBAG DARRELL! R.I.P.!!!
There are tons more bands I really dig, but I can't think of all of them right now.