A bit late to be asking this since I haven't tried playing in a couple of years, but how does music work in PON?
Is there a limit to the number of music clips that can be played?
I'm guessing that the engine looks for each country and general category (e.g. Italy, Peace) and rotates through all of the pieces that fulfil the necessary conditions.
It's an interesting approach, and I'm surprised it wasn't used in To End All Wars.