What key is your song in?

Drop an MP3. Get the key, mode, scale, tonal confidence, and key probability distribution in seconds — science-backed by MusicMind audio analysis. Detects 50+ scales.

Drop your MP3 to detect the key

or click to browse — MP3, WAV, OGG, FLAC

How it works

1

Drop your audio

Drag and drop any MP3, WAV, OGG, or FLAC file. No upload to our servers — everything runs locally in your browser.

2

Audio analysis

MusicMind's native engine runs key extraction, tempo estimation, energy analysis, and danceability detection — all instantly in your browser.

3

Get results

See your track's musical key, BPM, energy profile, frequency balance, and mood — all in under a second.

Who uses this

Producers

Find the key of a sample to match it with your project.

DJs

Check BPM and key for harmonic mixing.

Singers

Know the key before recording vocals over a beat.

Music Students

Train your ear by checking your guesses against automated analysis.

Frequently Asked Questions

How accurate is the key detection?+
Our key detection uses Krumhansl-Kessler profiles — the gold standard in music information retrieval research. Accuracy is typically 80-90% on well-produced tracks, with a confidence score to indicate reliability.
Is my audio uploaded to your servers?+
No. All analysis runs locally in your browser using native Web Audio APIs. Your audio never leaves your device. We only store the analysis results if you choose to share them.
What audio formats are supported?+
MP3, WAV, OGG, FLAC, AAC, and M4A. Any format your browser can decode will work.
How is BPM detected?+
We use autocorrelation-based tempo estimation, which analyzes the audio signal's periodicities to find the dominant tempo. It works best on tracks with a clear rhythmic pattern.
What is key probability distribution?+
Instead of a single key answer, MusicMind ranks all 24 keys by probability — for example, Am 72%, C major 24%, E minor 4%. This reveals tonal ambiguity and helps you make better creative decisions.
Does it detect modes beyond major and minor?+
Yes. MusicMind identifies Dorian, Phrygian, Lydian, Mixolydian, and other modes, plus 50+ scale types including pentatonic, blues, whole tone, and diminished scales.

Related

BPM Counter

Tap or upload to find the exact tempo of any track.

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Stem Analyzer

See the vocal, drum, bass, and harmonic balance of your track.

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Mood Analyzer

Science-backed mood detection — find the emotional character of any song.

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Analyze a track — free