Circle of Fifths

Choose a key to inspect its harmonic neighborhood, then open scale, chord, transposition or fretboard tools without losing the musical context.

Major key

Playback

—Relative minor

—Key signature

—Scale notes

—Diatonic chords

Practice and playback notes

connects timing, tuning, pitch reference, virtual instruments and music-theory tools without requiring an account. Existing interactive engines remain intact while the new workflow makes it easier to move from a practical task—keep time, tune, play, identify, transpose—to the next relevant tool.

Audio and theory boundaries

Microphone pitch detection depends on the device, room and signal quality. Equal-tempered frequency math does not measure a real instrument, and chord/scale naming can have multiple enharmonic or theoretical interpretations. Reference tones and noise should be used at comfortable playback levels; browser controls do not measure sound-pressure exposure.

Use this result with confidence

Use the wheel as a relationship map, not just a key list

Adjacent keys differ by one accidental and share much of their note material, which is why the wheel is useful for planning closely related moves. Select a key, inspect its scale and diatonic chords, then compare the neighboring dominant and subdominant areas instead of memorizing the circle as an isolated sequence.

Relative minor shares a key signature, not a tonal center

A major key and its relative minor use the same key signature but organize the notes around different tonic functions. When the tool shows the relative minor, listen for that different center rather than assuming the two keys are interchangeable. This distinction matters when analyzing progressions or choosing a modulation.

Diatonic chords are a starting palette

The seven displayed triads belong naturally to the selected major scale, but real songs can include secondary dominants, borrowed chords, modal mixture, and chromatic passing harmony. Use the diatonic list to establish the baseline key, then label outside chords explicitly instead of forcing every chord into the major-key set.

Verify enharmonic spelling in notation work

F-sharp and G-flat can sound the same on equal-tempered playback while requiring different written spellings in a score. The wheel may choose a convenient display spelling. For notation, theory assignments, or transposition, verify accidentals and chord spellings against the intended key signature before copying the result.