The circle of fifths is the most important diagram in Western music theory. It maps every major and minor key and shows you which keys are closely related — making it an essential tool for writing chord progressions and modulating between keys. Use our interactive Circle of Fifths tool to explore every key visually.
What is the circle of fifths?
The circle arranges the 12 musical keys in a loop, each one a perfect fifth apart. Moving clockwise, each key is 7 semitones (a perfect fifth) above the previous one:
C → G → D → A → E → B → F# → C# → Ab → Eb → Bb → F → C
Moving counterclockwise, each key is a perfect fourth above (or a fifth below) the previous one.
Why does it matter for chord progressions?
Keys that are neighbors on the circle share almost all the same chords. C major and G major share five of their seven chords. This is why it’s easy to modulate (smoothly move) between neighboring keys.
If you know the I–V–vi–IV in C major (C – G – Am – F), adding a single chord from G major can create a beautiful, natural transition.
The V–I move: the most powerful chord change
The most important principle from the circle of fifths: V resolves to I. G7 resolves to C. D7 resolves to G. A7 resolves to D. This pull is the engine of Western harmony.
Notice how the G7 creates tension that feels resolved when C arrives. This is the ii–V–I foundation of jazz:
The Dm7 → G7 → Cmaj7 moves counterclockwise on the circle three times in a row. Pure harmonic gravity.
How to use the circle for songwriting
1. Find closely related keys
If your song is in C major and you want to modulate, the easiest destinations are G major (one step clockwise) and F major (one step counterclockwise). Both share almost all your chords — the transition will feel smooth.
2. Borrow chords from neighboring keys
The IV and V chords of closely related keys make great “color chords” in your progression. In C major, borrowing an Ab major chord (from the parallel minor) adds instant emotional weight.
3. Use circle-of-fifths movement for progression momentum
Progressions that move around the circle feel harmonically driven. Here’s a classic circle-of-fifths sequence:
Each chord is a fifth below the previous one. This is one of the smoothest-sounding progressions in all of music theory.
The relative minor
Every major key has a relative minor key that uses the same chords but has a different tonal center. C major’s relative minor is A minor. They share the exact same chords — just starting from a different “home.”
- C major: C, Dm, Em, F, G, Am, Bdim
- A minor: Am, Bdim, C, Dm, Em, F, G
This is why C major and A minor progressions can feel interchangeable. The progression C–G–Am–F in C major becomes Am–F–C–G in A minor — same chords, different emotion.
Understanding the circle of fifths will transform how you write and analyze music. Open the interactive Circle of Fifths tool and click through different keys — you’ll see the diatonic chords change in real time. For jazz applications, explore the jazz chord progressions library where the circle-of-fifths movement is most visible. Or open Chord Player and build progressions that move around the circle — you’ll hear the theory come alive.
The circle of fourths: the same circle, other direction
Moving counterclockwise on the circle of fifths is often called the circle of fourths — because each step counterclockwise is a perfect fourth higher (or a fifth lower).
C → F → Bb → Eb → Ab → Db → Gb → B → E → A → D → G → C
Why does this matter? Because counterclockwise movement is where most pop progressions naturally travel. When you play C → F → Bb → Eb, you’re moving through the circle of fourths. Each chord feels like a natural step “home” toward the left.
The ii–V–I move (Dm–G–C) is actually a two-step counterclockwise move on the circle. D is a fifth above G, and G is a fifth above C. Moving counterclockwise = moving toward resolution.
Secondary dominants: adding tension anywhere
A secondary dominant is a dominant 7th chord built a fifth above any diatonic chord — not just the I. It creates temporary tension that resolves to that chord as a momentary “home.”
The most common secondary dominants in pop and jazz:
- V/V — the dominant of the dominant. In C major, the V chord is G. The V/V is D7 (the chord a fifth above G). Playing D7 → G creates a mini ii–V–I moment inside your progression.
- V/ii — in C major, the ii chord is Dm. The V/ii is A7. Playing A7 → Dm creates the same pull but toward Dm instead of C.
- V/IV — in C major, C7 (!) is the V/IV. It resolves to F major. This move is extremely common in blues.
Example of V/V in action:
The D7 doesn’t belong to C major at all (C major has no F#), but it creates powerful forward momentum toward G, which then resolves to C.
Modulating between keys: the pivot chord technique
Modulation means changing the tonal center from one key to another within a song. The smoothest way to do it is with a pivot chord — a chord that belongs to both the original key and the destination key.
Example: Modulating from C major to G major.
Shared chords between C major and G major:
- G major (V in C, I in G)
- Em (iii in C, vi in G)
- Am (vi in C, ii in G)
- D major (V in G but not in C — this makes it a great “announcement” chord)
A pivot modulation might look like:
C – G – Am – D7 – G
The Am chord is the pivot: it’s the vi in C major, and simultaneously the ii in G major. After Am, the D7 (V in G) makes it clear we’ve arrived in G — and the G chord confirms it.
Full diatonic chord table for all 12 major keys
| Key | I | ii | iii | IV | V | vi | vii° |
|---|---|---|---|---|---|---|---|
| C | C | Dm | Em | F | G | Am | Bdim |
| G | G | Am | Bm | C | D | Em | F#dim |
| D | D | Em | F#m | G | A | Bm | C#dim |
| A | A | Bm | C#m | D | E | F#m | G#dim |
| E | E | F#m | G#m | A | B | C#m | D#dim |
| B | B | C#m | D#m | E | F# | G#m | A#dim |
| F# | F# | G#m | A#m | B | C# | D#m | E#dim |
| Db | Db | Ebm | Fm | Gb | Ab | Bbm | Cdim |
| Ab | Ab | Bbm | Cm | Db | Eb | Fm | Gdim |
| Eb | Eb | Fm | Gm | Ab | Bb | Cm | Ddim |
| Bb | Bb | Cm | Dm | Eb | F | Gm | Adim |
| F | F | Gm | Am | Bb | C | Dm | Edim |
Bookmark this table. Any time you’re in a key and want to know which chords are available to you, look up the row.
Using the circle of fifths for improvisation
If you improvise melodies or solos over chord progressions, the circle of fifths tells you something crucial: notes that are far apart on the circle create more tension; notes that are close together are more consonant.
Practical application when improvising over a ii–V–I in C (Dm–G–C):
- Over Dm, emphasize D, F, and A (the chord tones). Avoid notes that belong to C but clash with Dm (like B natural, which creates a major 7th tension).
- Over G7, lean into the F natural — it’s the b7 of G dominant, which creates the defining tension of the dominant chord.
- Over C, resolve to E or G — the 3rd and 5th of C major feel the most “arrived.”
The circle helps you visualize which notes are “near” or “far” from any chord. Moving through the circle step by step in your melody creates smooth, connected lines; leaping across the circle creates surprise and tension.
Use Chord Player to set up a ii–V–I loop and practice improvising over it. The visual chord display shows you the chord tones as you go.