Here you go; http://www.youtube.com/watch?v=fqjegQRRk_I This is a song by Sleep and I strongly recommend you check it out. I swear hours go by with me listening to this genre, and it seems like less than minutes.
I've listened to most songs in this thread, and this surprised me the most...not my sort of thing, but I've listened to it twice!
This is an awesome EPIC of a song: http://www.youtube.com/watch?v=r3ntHpYocc0
Skip to 1:30 if the intro isn't your kinda thing.