Slayer.
The lyrics are good (especially Kings lyrics), the guitar solo\'s are insane, Tom Ariya\'s singing is great, and they just rule
Tool.
Nobody out there writes lyrics like Maynard, and nobody sings as well as he can. Adam Jones is also extremely talented, and the rest of the band all very talented people.
Cannibal Corpse while Chris Barnes was still with them
Very few people out there write stuff as sick as Mr. Barnes writes, and his growls rule
Deicide
Glen Benton really means what he writes, while a lot of death metal bands write satistic lyrics to look and sound cool, very few of them actually mean what they write, Glen Benton does.
The things that I look for in rock is meaning behind the lyrics, if they have a reason to write what they write I respect it, and that\'s what I love about Tool, all of Maynards lyrics have a deep meaning behind them, and everyword actually means something.
I also like good singers, I didn\'t mention Obituary in the above list (I left out alot of good bands) but I like how they have a very unique (and strange) way of singing. Guitar riffs and all these things I look for in rock. There is so much that intreques me in hard rock that I can\'t really count it all.