I tried it on one of my own tunes: https://lamucal.ai/songs/adrian-holovaty/adrian-holovaty-the-aching-waltz https://lamucal.ai/songs/adrian-holovaty/adrian-ho

I tried it on one of my own tunes: https://lamucal.ai/songs/adrian-holovaty/adrian-holovaty-the-aching-waltz https://lamucal.ai/songs/adrian-holovaty/adrian-holovaty-the... The beats/chords were consistently a full beat off, and the chords were probably only 50% right. I chose this tune because (to my ears) the harmony is pretty clear. Compare this to my own manually created transcription of the same tune, and it's night-and-day difference: https://www.soundslice.com/slices/tpbwc/ https://www.soundslice.com/slices/tpbwc/ Beat detection and chord detection are hard problems, likely due to a lack of diverse training data. Chordify (another site that does this, which has been around for ages) has roughly similar performance. Full disclosure: I run Soundslice, a website built around synced sheet music, in which there's no automatic transcription involved (maybe someday, but the tech isn't good enough yet!). I've been following these developments for 15+ years.