Find the boundary
The harmony before and after each candidate bar is compared, and the boundary is kept only where the reading actually changes.
Key-change detection
Plenty of songs change key — a gear change in the last chorus, a live version that steps up. The analysis finds the bar where it happens and marks it, so the place your chart stopped making sense is a place you can see.
Download freeHow it works
Raise the flag
A gold flag appears on the chord track at that bar, with the new key written on it.
Read on in the new key
Chords after the flag are spelled in the key that is now sounding, so the chart keeps reading correctly to the end.
What you get
- The bar where the tonality changes
- The new key, named on the track
- A chart that stays correct after the change
Where it stops
A modulation is marked only when the evidence is strong; a passage that is merely ambiguous between two keys is left alone rather than guessed at. A song that changes key every few bars is better annotated by hand.
Questions
Why does this matter for live versions?
A live take often adds a step up at the end. Without the flag, the last chorus looks like a page of wrong chords.
Can I add a key change myself?
You can transpose anywhere you like; the marker itself comes from the analysis.
Does the PDF show the key changes?
The PDF prints the key the chart is written in; the flags that mark each change live on the chord track in the app.
Related
Lyrics when you want them
The lyric track runs under the chords and follows the same playhead, and any line you disagree with is yours to fix by hand.
Your language, built in
The whole interface is translated, and the menu names every language in itself — 日本語, 简体中文, Español — instead of making you read English to find yours.
Five-stem separation
Every track splits into five — guitar, drums, bass, vocals and piano — so you can hear your part alone, or drop it out and play over the rest.