Key?Estimated tonal centre (major or minor). Often uncertain in improvisation. Two keys mean start and middle differ.

D Dur

Meter?Estimate of 4/4, 3/4 or 6/8. With improvisation and triplets this is often uncertain – the ear decides.

4/4

Stability?How long the same pitch stays in the foreground. High: the harmony holds. Low: it wanders.

medium

47%

Character?Audible onsets per minute – attacks, accents, new notes. This is not tempo (BPM).

dense

211 onsets/min

Harmony?Share of sustained tones versus impulses (attacks, cymbals, percussion). A rough balance, not a verdict on harmony.

52% · 48%

Timbre?warm, medium or bright – a rough estimate of whether the sound feels dark-warm or bright-sharp.

bright

Automatic estimate (librosa). · Mitte 5:16–7:16 Learn more