All my code is Free Software, which means that you are free to download it, modify it and redistribute it without asking for my permission (you already have it.)
Shiva indexes all your music, extracts its meta-data and exposes a RESTful API with it so you can easily query it.
I have a lot of code in my github repo. Mostly is just broken/incomplete, ideas that I had but never finished. Feel free to browse around.