CTO at previous job was responsible for one of the better heuristic algorithms from the era before ML took over and our product dealt with this problem. I'm in

CTO at previous job was responsible for one of the better heuristic algorithms from the era before ML took over and our product dealt with this problem. I'm inclined to disagree with your assessment. Transcription is to polyphonic pitch detection what machine translation is to OCR. We are okay at the latter, which is what folks like Celemony make their living in. We still suck terribly at the former. The last 20% will be fiendishly hard, as it depends on a mountain of cultural knowledge. A tool to help amateur transcribers to get ~70% of the way is probably within reach of current tech.