Song analyzer

BPM, key and chords of an audio file.

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How it works

Tempo is estimated from the onset envelope and its autocorrelation.
The key compares the 12-note profile with Krumhansl's profiles; chords come from harmonic templates.
It works best on music with a clear beat and harmony; on rubato or very dense music it is a hint, not the truth.

Everything happens on this device: no file is uploaded and nothing leaves the browser.