Kickass Classical Forums

I've been up for hours trudging through it all and I couldn't find it despite how popular it is. I know jack about classical (grew up on hip-hop and metal) but love what I hear and I want to get this tune badly.

Here is a clip from the commercial for the movie The Nightmare Before Christmas.

http://www.youtube.com/watch?v=8qrB9I3DM80

It's most likely part of the film soundtrack.