segregation of progressions: one leaderboard per stream, each song jumpable into its video at the occurrence. 408,129 songs Songsterr-synced (per-measure) · 1349 trusted calibrations · 66 dead videos replaced · 81 flagged dead · built 2026-08-14 20:01
key-free 4-chord shapes (interval-from-first-root + quality)
100 progressions · 40 vamps · 2,800 song rows
key-free 4-note shapes over bass pitch classes
100 progressions · 11 vamps · 2,220 song rows
4 sung notes, directed semitone steps
100 progressions · 24 vamps · 2,466 song rows
4 notes from the string/keys stream, directed semitone steps
100 progressions · 24 vamps · 2,480 song rows
per-bar kick/snare patterns on the 8th grid
100 progressions · 40 vamps · 2,800 song rows
every synced song, all its progression streams, jumpable in the synced video
302,173 songs · search by artist/title/genre
tier-A duplicate-transcription agreement per stream — the 96% instrument
4,898 pairs scored · distributions + lowest pairs
Verdict buttons on every page persist in this browser and export as JSON — that export is stage 1's human confirmation set. Serve via START_SITE.bat (embeds need an http referer; file:// shows error 153).