Hear the idea before you study it.
Move clockwise by a perfect fifth to add one sharp; move anticlockwise by a perfect fifth to add one flat. In chord progressions, descending-fifth roots often create a strong sense of direction.
Part 01
Walk around the circle
Start with C major at the top of the circle: no sharps or flats. Move clockwise to G major, a perfect fifth above C. G has one sharp, F♯. Continue to D major and you have two sharps, F♯ and C♯. The sequence continues A, E, B, F♯ and beyond.
Write C in the middle of a page, then G and D on the right, F and B♭ on the left. Count the altered notes as you move outward.
04 · Go deeper into walk around the circle
Moving anticlockwise from C takes you to F major, which has one flat, B♭. Another step goes to B♭ major with two flats, then E♭ major with three. Adjacent keys are closely related because they share six of their seven scale pitch classes.
The full circle eventually returns to the starting pitch class. At the far side, keys such as F♯ and G♭ sound the same on a standard equal-tempered piano even though their written spellings and key signatures differ.
- C major
- No sharps or flats. Relative minor: A minor.
- G major
- One sharp (F♯). Relative minor: E minor.
- D major
- Two sharps (F♯, C♯). Relative minor: B minor.
- F major
- One flat (B♭). Relative minor: D minor.
- B♭ major
- Two flats (B♭, E♭). Relative minor: G minor.
Part 02
Relative major and minor
Every major key has a relative natural minor that uses the same key signature. C major and A minor are relatives; G major and E minor are relatives. The minor tonic is a minor third below its relative major tonic.
Play C–Am–F–G–C, then Am–F–G–Am. Ask which chord sounds like home at the end of each version.
04 · Go deeper into relative major and minor
Relative does not mean identical. A C-major phrase might return to C and sound settled. An A-minor phrase can use the same white notes but establish A as its home. Harmony, bass movement and melodic emphasis are what make the difference.
You can use the circle to find a plausible neighbouring key when writing a song. But changing key is a musical choice, not a requirement imposed by the diagram.
Part 03
Why ii–V–I feels like a journey home
Jazz musicians often use ii–V–I because its bass roots follow descending fifths: D to G to C. In C major, that gives Dm7 → G7 → Cmaj7. The G7 has B and F, which have a strong tendency to move to C and E.
Before each Cmaj7, pause after G7. Try singing the note C in your head, then play the resolution.
04 · Go deeper into why ii–v–i feels like a journey home
The circle helps you recognise root relationships without needing to calculate every interval. D and G are neighbours, just as G and C are neighbours in the other direction.
Once you can hear this cadence, transpose it. Try Am7 → D7 → Gmaj7 in G major, or Gm7 → C7 → Fmaj7 in F major. The chord qualities stay consistent while the notes change.
Try the ideas for yourself.
Hear a progression, follow the keyboard and make a variation that feels like yours.