I have before come across this super large midi library called polyfonix or something like that and it had thousands of midi files for full songs in a huge variety of genres mostly old school. I doubt they have created these from scratch for every single song so am wondering if there is a software/plugin that quickly converts a full song to midi? These midi files had all the various instruments including the voice.
Preferably the software runs on Windows. Happy to look into anything that works great.