Check out the Forbidden zone, his first soundtrack - it is a musical. There are clips on the youtubes. It's a cult film. Black and white, low production values. Directed by his brother Richard. Much of the musical numbers are from old 40's and 50's recordings added in (including the 3 Stooges - modified) but there is lots of incidental background music that is classic Elfman, and also a couple songs with the mystic knights.
There is full frontal nudity, Not really appropriate for young teens and younger