Black Sabbath · Master of Reality

Lord of This World

Lord of This World is in C sharp minor at 134.9 beats per minute.

Tempo

135 BPM · Allegromedian of 165 analyses · 134.8–135.1 across the middle eight tenths

Key: C♯ minor4 sharps · the key most of the analyses agreed on
Agreement: 59%share of analyses that agreed
Analyses: 165people who ran the extractor
One beat: 444.8milliseconds, 60,000 ÷ BPM
Tuning: 438Hz · -8 cents from A 440
Dynamics: 2.43dB the level wanders from its average
Loudness: 0.952Essentia's 0–1 scale, not dB
Danceability: 1.257Essentia'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

165 independent analyses of this recording were submitted to AcousticBrainz. A bare majority of them — 59% — put it in C sharp minor, a key signature of 4 sharps. The tempo printed above is the median of the 165 readings; 99% of them land within 2% of it, and they barely differ at all.

At 134.9 BPM one beat lasts 444.8 milliseconds, so a sixteenth note is 111.2 ms and a dotted eighth 333.6 ms — the delay times for this recording. Counted half as fast it is 67.5 BPM, counted twice as fast 269.8. A score would mark that Allegro, by the ranges this site uses.

The analyses put the reference pitch of the recording at 438 Hz, which is 8 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 2.43 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 0.952 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 sharp 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 135 BPM

Note value	Beats	Milliseconds	Hertz
Whole note	4	1779.1	0.56
Half note	2	889.5	1.12
Dotted quarter	1.5	667.2	1.5
Quarter note (one beat)	1	444.8	2.25
Quarter triplet	0.667	296.5	3.37
Dotted eighth	0.75	333.6	3
Eighth note	0.5	222.4	4.5
Eighth triplet	0.333	148.3	6.75
Dotted sixteenth	0.375	166.8	6
Sixteenth note	0.25	111.2	8.99
Sixteenth triplet	0.167	74.1	13.49
Thirty-second note	0.125	55.6	17.99

Half time 67.5 BPM · double time 269.8 BPM. Every row is one beat (444.8 ms) times the fraction in the second column.

Closest in key and tempo

Recordings in C sharp minor, ordered by how near their tempo is to 135 BPM. A calculation, not a recommendation.

All songs in C sharp minor All songs at 135 BPM C♯ minor at 130–139 BPM Black Sabbath

MusicBrainz collapses 3 recording ids into this one. Recording id c825b3da-2573-4007-b042-90a4edb6acd1.