TempoPeek

AC/DC · T.N.T.

The Jack

The Jack is in A minor at 74.4 beats per minute.

4080120160200

Tempo

74 BPM · Adagiomedian of 368 analyses · 73.8–112.8 across the middle eight tenths
Key
A minorno sharps and no flats · the key most of the analyses agreed on
Agreement
86%share of analyses that agreed
Analyses
368people who ran the extractor
One beat
806.5milliseconds, 60,000 ÷ BPM
Tuning
436Hz · -16 cents from A 440
Dynamics
4.67dB the level wanders from its average
Loudness
0.776Essentia's 0–1 scale, not dB
Danceability
1.273Essentia'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

368 independent analyses of this recording were submitted to AcousticBrainz. Most of them — 86% — put it in A minor, a key signature of no sharps and no flats. The tempo printed above is the median of the 368 readings; 73% of them land within 2% of it, and the middle eight tenths of them run from 73.8 to 112.8 BPM.

At 74.4 BPM one beat lasts 806.5 milliseconds, so a sixteenth note is 201.6 ms and a dotted eighth 604.8 ms — the delay times for this recording. Counted half as fast it is 37.2 BPM, counted twice as fast 148.8. A score would mark that Adagio, by the ranges this site uses.

The analyses put the reference pitch of the recording at 436 Hz, which is 16 cents below 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 4.67 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 0.776 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 A 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 A minor

Each of these differs from A 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 74 BPM

Note valueBeatsMillisecondsHertz
Whole note43225.80.31
Half note21612.90.62
Dotted quarter1.51209.70.83
Quarter note (one beat)1806.51.24
Quarter triplet0.667537.61.86
Dotted eighth0.75604.81.65
Eighth note0.5403.22.48
Eighth triplet0.333268.83.72
Dotted sixteenth0.375302.43.31
Sixteenth note0.25201.64.96
Sixteenth triplet0.167134.47.44
Thirty-second note0.125100.89.92

Half time 37.2 BPM · double time 148.8 BPM. Every row is one beat (806.5 ms) times the fraction in the second column.

Closest in key and tempo

  1. Have Yourself a Merry Little ChristmasNeil DiamondA minor75BPM
  2. Mercy on MeChristina AguileraA minor76BPM
  3. Don’t Miss ItJames BlakeA minor71BPM
  4. Always Be My BabyMariah CareyA minor79BPM
  5. HurtNine Inch NailsA minor79BPM
  6. The OneFoo FightersA minor81BPM
  7. Sound Check (Gravity)GorillazA minor82BPM
  8. Boogie ManAerosmithA minor82BPM
  9. Grandma’s HandsBill WithersA minor82BPM
  10. [White Blur 2]Aphex TwinA minor83BPM

Recordings in A minor, ordered by how near their tempo is to 74 BPM. A calculation, not a recommendation.

All songs in A minorA minor at 70–79 BPMAC/DC

MusicBrainz collapses 225 recording ids into this one. Recording id 5aacbe6c-6447-44e3-ab42-b06788f4a04c.