It’s from “The Carnival of the Animals” by Saint-Saëns—and also used in the soundtrack of “Days of Heaven.”
Ooohhh...Misterioso. You gave me the key to the mysterious music. I love you...!!!
Track 01. (Days Of Heaven Soundtrack)
http://www.youtube.com/watch?v=W5mmmWIqZUQ
It does have a carnival feel to it. It reminds me of the creepy, but cool theme from the Elephant Man:
Elephant Man Main Theme
https://www.youtube.com/watch?v=4jYMHb1mtvw
Do you want some money? I’m willing to pay you. :)