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Very interesting. I don't suppose this would work with instrumental music?

Anyone know of a thing that does?

I tried a piano piece, and it provided some chords, but I'm not sure if the result is correct.

It's better than I would come up quickly with <https://lamucal.ai/songs/synergy/on-presuming-to-be-modern-i> getting the starts, ends and a few of the middle chords in each run, but misses most of the middle chords or gets them wrong.