In 7YIT it's the music box (initially) that plays it IIRC ... I really enjoyed that film, well worth a watch for those looking for things to do over tedious xmas!
The problem with google is that it gives you all the answers to all the questions anybody has ever answered, right or wrong
It rather ruins trivia quizzes though!
Just noticed that IMDB has a cross reference from music to movie - that makes it a little easier
Cheers,
Robin