Swan Lake
The main theme to Tchaikovsky's ballet Swan Lake is used at the beginning of the mummy scene in Waxwork, yet it is not mentioned in the end credits nor in the IMDb soundtrack info. I'm only bringing this up because when I first heard it in the movie I knew I had heard it before but I just couldn't place it, and thought maybe others had the same problem.
http://www.youtube.com/watch?v=jjDYW46PjA8