The Circle of Fifths — A Map of Twelve Keys

Adjacent keys are a fifth apart; clockwise adds sharps — the whole chart is a ruler

There is a clickable circle of fifths above. Click any segment to hear that key's tonic triad; click clockwise to hear all twelve.

The point of this page: this chart is not a table of "where twelve keys sit" — it is a ruler.

What the circle looks like

Below is a clickable circle. Click any segment to hear that key's tonic triad; click clockwise to hear all twelve.

Try this first: click clockwise all the way round

Two things will happen:

1. Adjacent segments differ very little — only one more sharp; 2. but the segment opposite differs most — six sharps against six flats.

That is the core of the circle: it turns "distance between keys" into something you can read.

The circle's three rules

1. Adjacent segments are a perfect fifth apart

From C clockwise to G is a perfect fifth; G to D is another perfect fifth.

A perfect fifth is the most consonant interval — so neighbouring keys are the closest in relationship. That is why moving one step along the circle is the cheapest modulation.

2. Clockwise adds sharps, anticlockwise adds flats

• clockwise from C: C → G (1♯) → D (2♯) → A (3♯)……
• anticlockwise from C: C → F (1♭) → B♭ (2♭) → E♭ (3♭)……

So the circle is also a table of key signatures. The number of accidentals in each segment is its distance from C.

3. Across the diagonal = relative keys

Two keys three segments apart (diagonally opposite) have a special relationship:

• relative major/minor: C–A minor, E–C♯ minor;
• parallel major/minor (not on this circle, at the two ends of one line).

A relative minor is only three semitones away, yet it sits three segments away on the circle — because relative keys are two versions of the same tonic.

A common misreading to clear up

"The further from C, the brighter" is only half true.

The accurate statement: the circle tells you the number of accidentals, not the brightness.

• C major (no accidentals) sounds the most "neutral";
• G major (one sharp) is a little brighter;
• F♯ major (six sharps) is the brightest — and it is furthest from C.

So "brightness" and "distance from C" are two different things. Position on the circle is distance; brightness is a property of timbre.

One practical use: if you are writing a passage that should get "brighter and brighter", moving clockwise is correct (sharps accumulate); to come back to the origin, walk anticlockwise.

An experiment you can run yourself

1. Click C and hear its tonic chord; 2. Click G, then D, going clockwise; 3. Then skip across the circle and click D♭ (the diagonal).

You will find that although the diagonal pair "looks far", their relationship is minor/major — only three semitones apart. That is the most counter-intuitive layer of the circle: visual distance is not auditory distance.

An honest note

The circle is a map of the Western tonal system, not of all music.

• Chinese pentatonic needs no key signature, so "which segment is it in" does not apply;
• some folk songs move within a single key and need no circle either.

The circle earns its keep by serving modulation — as soon as you need to change key, it is the fastest map available.

Next

• What transposition actually changes: one melody, three keys
• The scale of each key: modes
• Keys that need no circle: pentatonic scales
• The keyboard structure underneath: the glossary entry on key signatures

Sources

• 本页为五度圈交互演示的说明；五度圈关系依据通用乐理记法
• 实例均标注来源与许可档位，可在线试听

Used for fact-checking only; all prose is original.