TempoPeek

AC/DC · Fly on the Wall

Back in Business

Back in Business is in C minor at 108.5 beats per minute.

4080120160200

Tempo

109 BPM · Moderatomedian of 134 analyses · 79.7–108.6 across the middle eight tenths
Key
C minor3 flats · the key most of the analyses agreed on
Agreement
52%share of analyses that agreed
Analyses
134people who ran the extractor
One beat
553milliseconds, 60,000 ÷ BPM
Tuning
442.5Hz · +10 cents from A 440
Dynamics
3.27dB the level wanders from its average
Loudness
0.93Essentia's 0–1 scale, not dB
Danceability
1.242Essentia'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

134 independent analyses of this recording were submitted to AcousticBrainz. A bare majority of them — 52% — put it in C minor, a key signature of 3 flats. The tempo printed above is the median of the 134 readings; 87% of them land within 2% of it, and the middle eight tenths of them run from 79.7 to 108.6 BPM.

At 108.5 BPM one beat lasts 553 milliseconds, so a sixteenth note is 138.2 ms and a dotted eighth 414.7 ms — the delay times for this recording. Counted half as fast it is 54.3 BPM, counted twice as fast 217. A score would mark that Moderato, by the ranges this site uses.

The analyses put the reference pitch of the recording at 442.5 Hz, which is 10 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 3.27 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 0.93 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 minor; 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 C minor

Each of these differs from C minor 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 109 BPM

Note valueBeatsMillisecondsHertz
Whole note422120.45
Half note211060.9
Dotted quarter1.5829.51.21
Quarter note (one beat)15531.81
Quarter triplet0.667368.72.71
Dotted eighth0.75414.72.41
Eighth note0.5276.53.62
Eighth triplet0.333184.35.43
Dotted sixteenth0.375207.44.82
Sixteenth note0.25138.27.23
Sixteenth triplet0.16792.210.85
Thirty-second note0.12569.114.47

Half time 54.3 BPM · double time 217 BPM. Every row is one beat (553 ms) times the fraction in the second column.

Closest in key and tempo

  1. Running Up That Hill (A Deal With God)Kate BushC minor108BPM
  2. HypnotizedFleetwood MacC minor108BPM
  3. Intro (Back to Basics)Christina AguileraC minor108BPM
  4. I Like to Do ItKC and the Sunshine BandC minor109BPM
  5. I’m Movin’ OnRay CharlesC minor108BPM
  6. The Day Before You CameABBAC minor108BPM
  7. So Long, Frank Lloyd WrightSimon & GarfunkelC minor110BPM
  8. TrampOtis Redding & Carla ThomasC minor107BPM
  9. Whammy KissThe B‐52sC minor107BPM
  10. The Things You SaidDepeche ModeC minor110BPM

Recordings in C minor, ordered by how near their tempo is to 109 BPM. A calculation, not a recommendation.

All songs in C minorAll songs at 109 BPMC minor at 100–109 BPMAC/DC

MusicBrainz collapses 1 recording id into this one. Recording id 124565ae-5dab-41c9-a202-ee98e6bb4dce.