I really like that version of "Nature Boy" will all the messed up effects and played at a fast speed. The clip at the end makes it even better.
However, there's also a version of "Nature Boy" played at the scene when Christian throws money at Satine, leaving the theater. It's playing softly in the background, but it's just piano.
I've searched EVERYWHERE for it...but I can't find it. Any ideas?!