Remember this map from this year's joke gameday? It is a self playing piano. And yes, it actually plays the music in realtime. I wrote a program to convert midi files into I/O that works on the map. I can easily add pretty much any song as long it only uses one instrument. However, the map is not fun gameplay wise. Feel free to chat me up on steam if you think you have a layout that doesn't suck and want to use my fancy entity work.