The Creepiest Classical Composition

In my quest to assemble an outstanding play list for Halloween, I stumbled across what has to be one of the most disturbing classical music compositions I've ever heard.

(On a side note, I don't really consider scores from movie soundtracks classical compositions. Soundtrack scores are a separate genre altogether. Classical music pieces are works that stand alone as an individual work of art.)

I know what you are thinking, "How disturbing can classical music be?"

Listen for yourself here.

You've been warned...