1st and foremost: Tool
Rage Against the Machine
Rock is hard to generalize because of the massive amounts of sub genres. I'd throw Trivium around, along with Red Hot Chili Peppers, and even though I would've put Dream Theater in there for every amazingly epic song they have they make a terrible slow song. Panic Attack is one of the best songs ever made though.
The OFFICIAL Chiefs slogan, "Oh well, there's always next year."