The Nightmare Before Christmas is a post stop motion animation film that was created and produced by Tim Burton (before he lost his stride in my personal opinion). This film broke so many barriers at the time (1993), it was one of the first mainstream post stop animation films released (before it came Gumby and other less known shorts). Henry Selick (also known for Coraline) directed the film. Burton had no hand in any of the animation work because of Batman. The score and lyrics were created by Danny Elfman, a well known collaborator with Burton (Pee-wee's Big Adventure, Batman, etc).
Two useful items were invented during the making of this that would make animators lives a little easier. The first was a light alarm. This device would alert animators if any of the lights on any of the sets were down before they took the next shot. The second was a replacement system where in the animator was easily able to switch out a broken puppet for a new one.
The Nightmare Before Christmas has created a cult following that gains still is growing to this day. I hope you take the time to watch this if not only to see the hard work and long hours the animators committed. Happy holidays y'all.