@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
@elfi Rpgmaker 2000 is midi I don't recall about 2003. I'm not really in a position to pass any info off to them but that is a pretty good idea.
@LANthus 2003 was MIDI as well--I think they went as far as VX before finally dropping it, though WAV audio was supported as early as 2000 and I believe MP3/OGG support also developed as time went on