Only my other games at the moment! I've composed hundreds of songs, so it'll be a while before all of them will be made public. ^_^;
I do plan to release a music CD one day, once I gain professional traction.

Now that you say that though, I am inspired to include a Sound Test feature from now on. d(^^)
I'm thinking of doing an enhanced compilation of my "hobby" games, so I'll put it in retroactively too. :)

EDIT: I think you specifically meant this game's music, in which case, the enhanced compilation idea still applies.
Instead of an in-game function, maybe I'll just attach every OST to a dedicated music folder! :D