Britney Spears · Femme Fatale

Till the World Ends

Till the World Ends is in A flat major at 131.9 beats per minute.

Tempo

132 BPM · Allegromedian of 147 analyses · 131.9–132.1 across the middle eight tenths

Key: A♭ major4 flats · the key most of the analyses agreed on
Agreement: 99%share of analyses that agreed
Analyses: 147people who ran the extractor
One beat: 454.9milliseconds, 60,000 ÷ BPM
Tuning: 434.2Hz · -23 cents from A 440
Dynamics: 4.32dB the level wanders from its average
Loudness: 0.878Essentia's 0–1 scale, not dB
Danceability: 1.111Essentia'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

147 independent analyses of this recording were submitted to AcousticBrainz. All but a handful of them — 99% — put it in A flat major, a key signature of 4 flats. The tempo printed above is the median of the 147 readings; 97% of them land within 2% of it, and they barely differ at all.

At 131.9 BPM one beat lasts 454.9 milliseconds, so a sixteenth note is 113.7 ms and a dotted eighth 341.2 ms — the delay times for this recording. Counted half as fast it is 66 BPM, counted twice as fast 263.8. A score would mark that Allegro, by the ranges this site uses.

The analyses put the reference pitch of the recording at 434.2 Hz, which is 23 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 4.32 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 0.878 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 132 BPM

Note value	Beats	Milliseconds	Hertz
Whole note	4	1819.6	0.55
Half note	2	909.8	1.1
Dotted quarter	1.5	682.3	1.47
Quarter note (one beat)	1	454.9	2.2
Quarter triplet	0.667	303.3	3.3
Dotted eighth	0.75	341.2	2.93
Eighth note	0.5	227.4	4.4
Eighth triplet	0.333	151.6	6.6
Dotted sixteenth	0.375	170.6	5.86
Sixteenth note	0.25	113.7	8.79
Sixteenth triplet	0.167	75.8	13.19
Thirty-second note	0.125	56.9	17.59

Half time 66 BPM · double time 263.8 BPM. Every row is one beat (454.9 ms) times the fraction in the second column.

Closest in key and tempo

Recordings in A flat major, ordered by how near their tempo is to 132 BPM. A calculation, not a recommendation.

All songs in A flat major All songs at 132 BPM A♭ major at 130–139 BPM Britney Spears

MusicBrainz collapses 7 recording ids into this one. Recording id c0a6ef98-6284-48d4-9e44-fd38bcbae5ad.