The Circle of Fifths

What it is

The Circle of Fifths arranges all 12 notes in a circle, each separated by a perfect fifth (7 semitones).

Starting at the top with C and moving clockwise (up a fifth each step):

C → G → D → A → E → B → F♯/G♭ → D♭ → A♭ → E♭ → B♭ → F → (back to C)

Moving counter-clockwise (down a fifth, or up a fourth) gives you the same circle in reverse.

What each direction tells you

Clockwise (sharps): each key adds one sharp.

• C major: 0 sharps
• G major: 1 sharp (F♯)
• D major: 2 sharps (F♯, C♯)
• A major: 3 sharps (F♯, C♯, G♯)
• E major: 4 sharps
• B major: 5
• F♯ major: 6
• C♯ major: 7

Counter-clockwise (flats): each key adds one flat.

• C major: 0 flats
• F major: 1 flat (B♭)
• B♭ major: 2 flats
• E♭ major: 3
• A♭ major: 4
• D♭ major: 5
• G♭ major: 6
• C♭ major: 7

When you see a key signature on sheet music with 3 sharps, look at the 4th sharp it would add — the note one half-step above the last sharp — and that’s the tonic. Or just memorise that 3 sharps = A major / F♯ minor.

Relative minors

Each major key has a relative minor on the inside of the circle. Same notes, different home. Already covered in Relative & parallel keys.

Why composers love the Circle

1. It tells you which keys are “close”

Adjacent keys on the Circle share six out of seven notes. So modulating from C to G (or C to F) is smooth — only one note changes. Modulating to F♯ (across the circle) is jarring — six notes change.

This is why most key changes in pop songs go up by a fifth (C → G) or up by a half-step (C → C♯, a much more dramatic change).

2. It shows you the V→I motion

Every chord on the Circle is the V of the chord clockwise of it. So: - G is the V of C - D is the V of G - A is the V of D - etc.

A chord progression that walks around the Circle counter-clockwise is a sequence of “V → I” resolutions — and your ear loves it. This is why progressions like Em - Am - Dm - G - C work so well (each chord resolves into the next).

3. It tells you the diatonic chords of any key

The chords of a major key are 6 adjacent keys on the Circle, with the tonic in the middle:

For C major: F (IV) - C (I) - G (V) - D (ii, but minor) - A (vi, minor) - E (iii, minor).

Just look at the Circle and the diatonic family appears.

A circle-of-fifths progression

The most famous Circle-of-Fifths progression — the “rhythm changes bridge” — runs the cycle in 7ths:

III7 → VI7 → II7 → V7 → I

In C: E7 → A7 → D7 → G7 → C. Each chord’s root is a fifth down from the previous. Every chord is a dominant 7th setting up the next. Used in “Sweet Georgia Brown”, “I Got Rhythm” bridge, and a thousand jazz standards.

Try this

Memorise the Circle by saying the names out loud, clockwise: C, G, D, A, E, B, F♯, D♭, A♭, E♭, B♭, F, C. Do this once a day for a week. Now do it counter-clockwise.

Once it’s automatic, you’ll spot key signatures, secondary dominants, and key relationships in real time.