Why do I like this song? Because its short, creepy, and when sung by the right choir, it sounds even more creepier. But then there's a part in the song that sounds reassuring, I think music-minded people call that the bridge. I'd like to hear P Daddy do a remix of this. Oh, its called Daemon Irrepit Callidus. It means "Demon's armpit colliding."

"Daemon Irrepit Callidus" by the Madrigal Singers

"Daemon Irrepit Callidus" by better off anonymous.
By far the best rendition i've seen yet.