Birds

140 independent analyses of this recording were submitted to AcousticBrainz. Most of them — 91% — put it in C major, a key signature of no sharps and no flats. The tempo printed above is the median of the 140 readings; 97% of them land within 2% of it, and the middle eight tenths of them run from 151.6 to 154.3 BPM.

At 151.9 BPM one beat lasts 395 milliseconds, so a sixteenth note is 98.7 ms and a dotted eighth 296.2 ms — the delay times for this recording. Counted half as fast it is 76 BPM, counted twice as fast 303.8. A score would mark that Allegro, by the ranges this site uses.

The analyses put the reference pitch of the recording at 437.5 Hz, which is 10 cents below concert A at 440 Hz — the sort of drift a tape machine or a slightly different mastering leaves behind. That is a fact about this transfer of the music, not about how it was played.

The dynamic complexity of the recording measures 6.84 dB: that is how far the level wanders from its own average, so a small number means a loud, flat master and a large one means a recording that still breathes. Its average loudness is 0.474 on Essentia's 0-to-1 scale, which is not decibels and is not comparable to a streaming service's number.

10 other recordings here are in C major; the ones listed below are the closest in tempo.