@LANthus I don't recall much from my RPG Making days, but if they're still using MIDIs they might want to contact TAM Music Factory and Freedom House 2nd for a nonexclusive license on their music
For streaming media, Peritune offers CC-BY licensed music
@LANthus Yeah, both 2000 and 2003 had some WAV-based background noises, before XP moved those to being "Music Effects"
@elfi I'm more meaning I don't know if the runtime package for 2003 is entirely midi. If I recall it included a few WAV song to show off compatibility