TempoPeek

AC/DC · Highway to Hell

Night Prowler

Night Prowler is in D flat major at 99.2 beats per minute.

4080120160200

Tempo

99 BPM · Andantemedian of 380 analyses · 99.1–99.2 across the middle eight tenths
Key
D♭ major5 flats · the key most of the analyses agreed on
Agreement
99%share of analyses that agreed
Analyses
380people who ran the extractor
One beat
604.8milliseconds, 60,000 ÷ BPM
Tuning
444.3Hz · +17 cents from A 440
Dynamics
3.87dB the level wanders from its average
Loudness
0.829Essentia's 0–1 scale, not dB
Danceability
1.078Essentia's danceability, 0–3

Source: AcousticBrainz, dump of 2022-06-23 (CC0) · MusicBrainz core data, 2026-09-17 (CC0) · how each number is measured. Measured up to 23.06.2022 — AcousticBrainz stopped collecting in 2022, so nothing released after that date is here.

What the numbers say

380 independent analyses of this recording were submitted to AcousticBrainz. All but a handful of them — 99% — put it in D flat major, a key signature of 5 flats. The tempo printed above is the median of the 380 readings; 100% of them land within 2% of it, and they barely differ at all.

At 99.2 BPM one beat lasts 604.8 milliseconds, so a sixteenth note is 151.2 ms and a dotted eighth 453.6 ms — the delay times for this recording. Counted half as fast it is 49.6 BPM, counted twice as fast 198.4. A score would mark that Andante, by the ranges this site uses.

The analyses put the reference pitch of the recording at 444.3 Hz, which is 17 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 3.87 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 0.829 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 flat major; the ones listed below are the closest in tempo.

Beats per bar are not in this dataset. AcousticBrainz's analysis reports a tempo, a key and a loudness, and no time signature at all, so this page does not print one — a 4/4 here would be a guess dressed as a measurement.

Keys that fit with D♭ major

Each of these differs from D♭ major by at most one accidental, or shares its tonic. That is the whole of what a mixing wheel encodes; here the relations are named instead of numbered.

Delay times at 99 BPM

Note valueBeatsMillisecondsHertz
Whole note42419.40.41
Half note21209.70.83
Dotted quarter1.5907.31.1
Quarter note (one beat)1604.81.65
Quarter triplet0.667403.22.48
Dotted eighth0.75453.62.2
Eighth note0.5302.43.31
Eighth triplet0.333201.64.96
Dotted sixteenth0.375226.84.41
Sixteenth note0.25151.26.61
Sixteenth triplet0.167100.89.92
Thirty-second note0.12575.613.23

Half time 49.6 BPM · double time 198.4 BPM. Every row is one beat (604.8 ms) times the fraction in the second column.

Closest in key and tempo

  1. Who Is He (and What Is He to You)?Bill WithersD♭ major99BPM
  2. Million Dollar ManLana Del ReyD♭ major99BPM
  3. Paper GangstaLady GagaD♭ major99BPM
  4. You DoAimee MannD♭ major99BPM
  5. The Kids Aren’t AlrightThe OffspringD♭ major100BPM
  6. Tight Wad HillGreen DayD♭ major99BPM
  7. Say GoodbyeBlack Eyed PeasD♭ major100BPM
  8. TeamLordeD♭ major100BPM
  9. Wu-Tang ForeverDrakeD♭ major100BPM
  10. This Little Girl of MineRay CharlesD♭ major100BPM

Recordings in D flat major, ordered by how near their tempo is to 99 BPM. A calculation, not a recommendation.

All songs in D flat majorAll songs at 99 BPMD♭ major at 90–99 BPMAC/DC

MusicBrainz collapses 4 recording ids into this one. Recording id 29526234-2eb5-4be4-93c0-d290cb9001e7.