Foreword

150 independent analyses of this recording were submitted to AcousticBrainz. Fewer than half of them — 49% — put it in B flat major, a key signature of 2 flats. The tempo printed above is the median of the 150 readings; 21% of them land within 2% of it, and the middle eight tenths of them run from 116.6 to 172.3 BPM. That is a recording the detector cannot settle on — the readings are spread far enough that the median is a summary of a disagreement rather than a measurement anybody should trust to the decimal.

At 163.5 BPM one beat lasts 367 milliseconds, so a sixteenth note is 91.7 ms and a dotted eighth 275.2 ms — the delay times for this recording. Counted half as fast it is 81.8 BPM, counted twice as fast 327. A score would mark that Vivace, by the ranges this site uses.

The analyses put the reference pitch of the recording at 434.2 Hz, which is 23 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 11.92 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 0.009 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 B flat major; the ones listed below are the closest in tempo.