On: Transcribing Piano Rolls, the Pythonic Way

[gtani]

i've seen NNLS/chroma referenced in a few places, like the chordify papers:

http://isophonics.net/nnls-chroma

Here's chordify: http://ismir2012.ismir.net/event/papers/295_ISMIR_2012.pdf

That conference has great references but unfortunately hasn't been repeated since 2012 http://www.ismir.net/proceedings/index.php