Music as computation
Tuning, rhythm and recorded performance, treated as things you can compute, measure and check for yourself.
Nothing here asks you to take a claim on trust. If you can hear it, there's a button. If it's a number, you get the method that produced it, including what that method can't tell you.
Why the piano is out of tune on purpose
Twelve perfect fifths miss seven octaves by a quarter of a semitone. Equal temperament is the fix, and you can hear what it costs.
One algorithm, most of the world's rhythms
Spread k strikes as evenly as possible over n beats. Traditional patterns from four continents fall out of two integers.
Seven million notes
Nobody plays a chord all at once, and you can tell roughly when a piece was written from how much pedal it gets. Measured across 199 hours of competition piano.