TempoPeek

AC/DC · Back in Black

Hells Bells

Hells Bells is in D major at 107.1 beats per minute.

4080120160200

Tempo

107 BPM · Andantemedian of 494 analyses · 107–112.6 across the middle eight tenths
Key
D major2 sharps · the key most of the analyses agreed on
Agreement
85%share of analyses that agreed
Analyses
494people who ran the extractor
One beat
560.2milliseconds, 60,000 ÷ BPM
Tuning
441.3Hz · +5 cents from A 440
Dynamics
3.08dB the level wanders from its average
Loudness
0.919Essentia's 0–1 scale, not dB
Danceability
1.415Essentia'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

494 independent analyses of this recording were submitted to AcousticBrainz. Most of them — 85% — put it in D major, a key signature of 2 sharps. The tempo printed above is the median of the 494 readings; 87% of them land within 2% of it, and the middle eight tenths of them run from 107 to 112.6 BPM.

At 107.1 BPM one beat lasts 560.2 milliseconds, so a sixteenth note is 140.1 ms and a dotted eighth 420.2 ms — the delay times for this recording. Counted half as fast it is 53.6 BPM, counted twice as fast 214.2. A score would mark that Andante, by the ranges this site uses.

The analyses put the reference pitch of the recording at 441.3 Hz, which is 5 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 3.08 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 0.919 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.

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 107 BPM

Note valueBeatsMillisecondsHertz
Whole note42240.90.45
Half note21120.40.89
Dotted quarter1.5840.31.19
Quarter note (one beat)1560.21.79
Quarter triplet0.667373.52.68
Dotted eighth0.75420.22.38
Eighth note0.5280.13.57
Eighth triplet0.333186.75.36
Dotted sixteenth0.375210.14.76
Sixteenth note0.25140.17.14
Sixteenth triplet0.16793.410.71
Thirty-second note0.1257014.28

Half time 53.6 BPM · double time 214.2 BPM. Every row is one beat (560.2 ms) times the fraction in the second column.

Closest in key and tempo

  1. Pidgin EnglishElvis Costello & The AttractionsD major107BPM
  2. Down UnderMen at WorkD major107BPM
  3. Like Being AliveMeat PuppetsD major107BPM
  4. BadgeCreamD major107BPM
  5. Jack‐AssBeckD major107BPM
  6. Knowing Me, Knowing YouABBAD major108BPM
  7. KayleighMarillionD major107BPM
  8. We Can Work It OutThe BeatlesD major108BPM
  9. Strange BrewCreamD major106BPM
  10. Mellow YellowDonovanD major106BPM

Recordings in D major, ordered by how near their tempo is to 107 BPM. A calculation, not a recommendation.

All songs in D majorAll songs at 107 BPMD major at 100–109 BPMAC/DC

MusicBrainz collapses 117 recording ids into this one. Recording id c7c25302-69ab-4a9d-b967-23cbc6793854.