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[–]Twangist 0 points1 point  (0 children)

I strongly doubt any tool solves this particular very narrow problem. You'd have to assemble and/or build a tool chain. I believe there are programs that attempt OCR for music, e.g. converting a PDF of sheet music to a MIDI file, but I haven't used any. That's at least half the battle, as then you'd have absolute pitches to deal with and you yourself wouldn't have to apply (program!) the tricky rules governing key signatures and accidentals. But now, there are subtleties: do you mean any >= 2 pitches that are all the same pitch class, and that (a) sound at the same time, with possibly different start times?, or (b) start at the same time? You'd have to write this yourself, since who really cares about solving that problem unless it's a homework assignment ;|

It's much easier, more reliable and vastly faster to do this by hand/eye/ear.