Evil Music

All right, I've got to throw this question out to a wide audience now because it's been bothering me for half a week - what's the name of that piece that's often used as the stock epic "evil music"? Not Toccata and Fugue (really hypnotic video, by the way), the other one that starts with the chanting and timpani.

I would link to an example of the piece in question, but seeing as I really have no idea what to search for after all my usual Google tactics have failed, I can only provide this as an obvious Jimmy-Harting of it (and the game is in fact the reason why I ask in the first place).