Key Chord Builder
Build the diatonic chords of a selected key and label every degree with its harmonic role.
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Reading key settings
Building the scale
Labelling chord degrees
Preparing chord map
Result
When you need to understand a song progression or prepare a practice idea quickly, a full notation editor is often too much.
This tool runs in the browser and helps estimate keys, chords, or tuning without installing dedicated music software.
Treat the result as a musical guide: complex modulation and noisy recordings can still need a final ear check.