I'll go...

1. Pantera
2. Megadeth
3. Metallica
4. Iron Maiden
5. Slayer

Those are the bigs ones I find myself going back to all the time.

I never got into death metal, black metal, grind core, etc.

I liked some power metal when I was younger but the lyrics about dragons and medieval times eventually turned me off.

I was really big into nu-metal when I was a teenager and it was big. Korn, Limp Bizkit, Disturbed, System of a Down, Slipknot, Static X, ect ect. I'll go back and listen to that kind of stuff on the rare occasion.

I like Black Sabbath but not huge into them. Was never a big Ozzy fan either outside of the classics.