Data

Key Distribution Across Tracks

Which musical keys are most popular? Data from real audio analysis.

Illustrative values, not research results: no measured MusicMind data is published for this page yet.

Demo data, not research results
C major
1
C minor
0.7
Db major
1
Db minor
0.7
D major
1
D minor
0.7
Eb major
1
Eb minor
0.7
E major
1
E minor
0.7
F major
1
F minor
0.7
F# major
1
F# minor
0.7
G major
1
G minor
0.7
Ab major
1
Ab minor
0.7
A major
1
A minor
0.7
Bb major
1
Bb minor
0.7
B major
1
B minor
0.7

Every song has a key — the tonal center that gives it harmonic identity. Some keys appear far more frequently than others in popular music. C major and G major dominate, while keys like F# major and Db minor are rare. This distribution isn't random: it reflects the physical layout of instruments (guitar and piano favor certain keys), vocal ranges, and cultural convention.

Key Insights

Demo data, not research resultsIllustrative statements until measured data is published.
  1. C major and G major account for over 25% of all analyzed tracks — the "default" keys of Western pop music.
  2. Minor keys collectively represent about 40% of tracks, with A minor being the most common minor key.
  3. Sharp keys (F#, C#, G#) are significantly rarer than flat keys (Bb, Eb, Ab), likely due to instrument ergonomics.
  4. The distribution closely mirrors the circle of fifths proximity to C major — keys farther from C are used less frequently.
  5. Mode distribution reveals Ionian (major) and Aeolian (natural minor) dominate, but Dorian and Mixolydian appear in 12% of tracks — especially in jazz, funk, and folk.
  6. Key ambiguity is more common than expected: 18% of tracks show dual-key confidence above 30%, suggesting frequent tonal ambiguity in modern production.

Methodology

Key detection uses autocorrelation combined with chroma vector analysis, matching the audio's pitch class profile against 24 major and minor key templates. Confidence scores below 60% are excluded from the distribution. Each track contributes one key to the count.

Want programmatic access to this data?

Leave your email and we'll notify you when the MusicMind data API launches.

Try this on your own track

Upload any song and see the full analysis in seconds.

Analyze a track — free

Frequently Asked Questions

Why is C major so common?+
C major uses only the white keys on a piano and has no sharps or flats in its key signature. It's the first key most musicians learn, and instruments are often designed with C major as the default. Guitar's open strings also favor C and G major.
Does the key affect the mood of a song?+
Research by Palmer et al. (2013) shows that listeners consistently associate major keys with brighter, warmer feelings and minor keys with darker, more introspective moods. The specific key also maps to colors through the Scriabin system — explored in our Music & Color research.
How accurate is the key detection?+
MusicMind's key detection achieves high accuracy on tracks with clear tonal centers. Tracks that modulate between keys or use ambiguous tonality may show lower confidence scores.

More Data

BPM Distribution Across Genres

How fast is music? Tempo distribution from real audio analysis.

Read more →

Most Common Chord Progressions

Which harmonic patterns dominate popular music? Data from transition analysis.

Read more →

Genre Distribution in Analyzed Tracks

What genres does MusicMind analyze most? Audio profile data by genre.

Read more →

Emotional Arc Patterns

Six universal shapes that define how songs build and release tension.

Read more →

Most Common Modes in Music

Beyond major and minor — mode distribution from real audio analysis.

Read more →

Rhythmic Heritage Across Genres

Clave patterns, swing ratios, and groove scores from real audio analysis.

Read more →

Harmonic Sophistication Across Genres

How complex are chord progressions? Data from real audio analysis.

Read more →
Analyze a track — free