My Favorite would be Tool because of the whole attitude and atomosphear they let off.
Others would be
Dream Theater
Led Zeppelin
The Beatles
The Who
Jefferson Airplan
Metallica
Megedeth
Iron Maiden
Judas Priest
Mastodon
In this Moment
Muse
UIGG
Nirvana
Pearl Jam
Slayer
Guns and Roses
System of a Down
The Black Dahlia Murder
The Devil Wears Prada
A Perfect Circle