To see the music code, click here.
As usual, my goal was simplicity and small file size, so anyone can edit it. So, no MP3, no plugins, etc. Just procedurally generated piano-like notes. Copyrights should not be a problem: these are generally very old tunes from public domain sources. See the idividual javascript files for where each tune came from. That information needs to be displayed discretely in the game when the musc is used.