Heroin

140 independent analyses of this recording were submitted to AcousticBrainz. A bare majority of them — 51% — 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; 6% of them land within 2% of it, and the middle eight tenths of them run from 143 to 184.6 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 154.4 BPM one beat lasts 388.6 milliseconds, so a sixteenth note is 97.2 ms and a dotted eighth 291.5 ms — the delay times for this recording. Counted half as fast it is 77.2 BPM, counted twice as fast 308.8. A score would mark that Allegro, by the ranges this site uses.

The analyses put the reference pitch of the recording at 440.8 Hz, which is 3 cents above concert A at 440 Hz — close enough to standard that a tuner would not argue. That is a fact about this transfer of the music, not about how it was played.

The dynamic complexity of the recording measures 4.17 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 0.672 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.