Because

337 independent analyses of this recording were submitted to AcousticBrainz. Most of them — 89% — put it in C sharp minor, a key signature of 4 sharps. The tempo printed above is the median of the 337 readings; 90% of them land within 2% of it, and the middle eight tenths of them run from 161.5 to 163.3 BPM.

At 163.1 BPM one beat lasts 367.9 milliseconds, so a sixteenth note is 92 ms and a dotted eighth 275.9 ms — the delay times for this recording. Counted half as fast it is 81.6 BPM, counted twice as fast 326.2. A score would mark that Vivace, by the ranges this site uses.

The analyses put the reference pitch of the recording at 439.7 Hz, which is 1 cents below 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 5.66 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 0.722 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 sharp minor; the ones listed below are the closest in tempo.