The map of every key and the chords inside it.
The circle of fifths, made interactive. Click any key and its whole chord family lights up — the 1, the 4, the 5, the relative minor. The single best picture of how keys and chords connect.
Click a key and its diatonic chords appear instantly.
Relative minors, borrowed chords, and where songs modulate.
Move a progression to the key the singer needs without the maths.
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