Chord Progression Slide Rule

Pick a tonic chord, then choose two to four chords from its numbered scale. Capital numerals are major chords. Lowercase numerals are minor chords. A flat (♭) lowers a chord by a half step. Or start from a preset and change any chord you like.

Your progression

1. Choose the tonic chord

2. Build the progression

Preset progressions

Each slot accepts a major numeral, a minor numeral, or no chord. A preset fills all four slots at once, and you can change any slot afterward.

3. Read the numbered scale

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