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Here's 800 Beatsage levels of UK rave anthems, techno, acid, house. All difficulties + standard, single and 90⁰ maps. Be selective, bmbf will crash if you have too many songs. https://uloz.to/file/f6C8IfGnHtTa/beatsaberlevels-zip

I'm not sure what your getting at, it sounds like your saying it is hard to implement. Well it is already been done and you go to the web site and feed it a song and it spits out vocal and instrumental mp3's.
The spleeter library is avaliable for download with pre trained AI for extracting up to 5 tracks (Vocals / drums / bass / piano / other separation) for the devs or anyone else to try more variants of removing/isolating portions of songs to see how beat sage handles them. I don't know if or how it might be better or worse with beat sage yet.