Summer ’68

192 independent analyses of this recording were submitted to AcousticBrainz. Most of them — 87% — put it in D major, a key signature of 2 sharps. The tempo printed above is the median of the 192 readings; 89% of them land within 2% of it, and the middle eight tenths of them run from 137.3 to 164.6 BPM.

At 164.5 BPM one beat lasts 364.7 milliseconds, so a sixteenth note is 91.2 ms and a dotted eighth 273.6 ms — the delay times for this recording. Counted half as fast it is 82.3 BPM, counted twice as fast 329. A score would mark that Vivace, by the ranges this site uses.

The analyses put the reference pitch of the recording at 442.3 Hz, which is 9 cents above 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 3.7 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 0.821 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 D major; the ones listed below are the closest in tempo.