Re: Songs that totally rock out
"Take Your Time (Coming Home)" by fun.
fun. is a great band that I think most people would enjoy. They aren't the type to normally "rock out" as most of their songs are of the catchy "nod-your-head" type, but the last track on their debut album (the only one so far) is one of the best jams I have ever heard.
Also, I agree that the last half of "Flood" by Tool rocks pretty hard.