I thought I could respond to this quickly - but the more I think about it the more bands come to mind, so here goes categorized and ordered
80s
1. Metallica
2. Judas Priest, Iron Maiden, Slayer, GnR, VH, Tesla, Ozzy (solo), Suicidal Tendencies, Crue, AC/DC, even Bon Jovi
90s
1. Tool, Soundgarden
2. Pearl Jam, Nirvana, Alice in Chains, Korn
Heavier
1. Slayer
2. Pantera, Testament
Rock
1. Rolling Stones
2. Led Zeppelin, Stevie Ray
Sorry, I like 'em all. I've probably forgotten some.
Good news is now it's 2007, less than 2 years until the Camaro will be out.