Transcribing Piano Rolls, the Pythonic Way

What this guy does with Python is just amazing:

> Piano rolls are these rolls of perforated paper that you feed to the saloon’s mechanical piano. They have been very popular until the 1950s, and the piano roll repertory counts thousands of arrangements (some by greatest names of jazz) which have never been published in any other form.
> In this post I show how to turn into playable sheet music with the help of a few lines of Python. At the end I provide the sheet music, a human rendition, and a Python package that implements the method (and can also be used to transcribe from MIDI files).

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