a four-bar song in pure tuning, written by everyone here.
while a bar plays, tap a triangle beside it to vote for the next chord: each keeps two notes and changes one. just before the bar line the favourite is written into the song, for everyone. with no votes, the chords stay as they are.
tap the chord’s notes to play along: everyone hears it, in time.
the intervals are pure, so the lattice never closes: a note comes back a little higher or lower each time, and the song slowly leaves day one’s tuning. the numbers say how far, in cents: a hundredth of a semitone.