TempoPeek

U2 · Boy

I Will Follow

I Will Follow is in A flat major at 155 beats per minute.

4080120160200

Tempo

155 BPM · Allegromedian of 172 analyses · 150.8–155 across the middle eight tenths
Key
A♭ major4 flats · the key most of the analyses agreed on
Agreement
95%share of analyses that agreed
Analyses
172people who ran the extractor
One beat
387.1milliseconds, 60,000 ÷ BPM
Tuning
442Hz · +8 cents from A 440
Dynamics
2.91dB the level wanders from its average
Loudness
0.944Essentia's 0–1 scale, not dB
Danceability
1.161Essentia'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

172 independent analyses of this recording were submitted to AcousticBrainz. All but a handful of them — 95% — put it in A flat major, a key signature of 4 flats. The tempo printed above is the median of the 172 readings; 84% of them land within 2% of it, and the middle eight tenths of them run from 150.8 to 155 BPM.

At 155 BPM one beat lasts 387.1 milliseconds, so a sixteenth note is 96.8 ms and a dotted eighth 290.3 ms — the delay times for this recording. Counted half as fast it is 77.5 BPM, counted twice as fast 310. A score would mark that Allegro, by the ranges this site uses.

The analyses put the reference pitch of the recording at 442 Hz, which is 8 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 2.91 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 0.944 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 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 A♭ major

Each of these differs from A♭ 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 155 BPM

Note valueBeatsMillisecondsHertz
Whole note41548.40.65
Half note2774.21.29
Dotted quarter1.5580.61.72
Quarter note (one beat)1387.12.58
Quarter triplet0.667258.13.88
Dotted eighth0.75290.33.44
Eighth note0.5193.55.17
Eighth triplet0.3331297.75
Dotted sixteenth0.375145.26.89
Sixteenth note0.2596.810.33
Sixteenth triplet0.16764.515.5
Thirty-second note0.12548.420.67

Half time 77.5 BPM · double time 310 BPM. Every row is one beat (387.1 ms) times the fraction in the second column.

Closest in key and tempo

  1. SunriseNorah JonesA♭ major155BPM
  2. Diamonds on the InsideBen HarperA♭ major155BPM
  3. Walking ContradictionGreen DayA♭ major154BPM
  4. HelloAdeleA♭ major156BPM
  5. My LoveCéline DionA♭ major156BPM
  6. This Is Your LifeCommodoresA♭ major154BPM
  7. Run To YouWhitney HoustonA♭ major152BPM
  8. Brain StewGreen DayA♭ major152BPM
  9. Bullet the Blue SkyU2A♭ major152BPM
  10. How Did I Fall in Love With YouBackstreet BoysA♭ major152BPM

Recordings in A flat major, ordered by how near their tempo is to 155 BPM. A calculation, not a recommendation.

All songs in A flat majorAll songs at 155 BPMA♭ major at 150–159 BPMU2

MusicBrainz collapses 705 recording ids into this one. Recording id fd0d654e-bd45-48fa-b5a2-3beac95f258f.