Janis Joplin · Pearl

A Woman Left Lonely

A Woman Left Lonely is in B flat major at 147.8 beats per minute.

Tempo

148 BPM · Allegromedian of 153 analyses · 147–148.1 across the middle eight tenths

Key: B♭ major2 flats · the key most of the analyses agreed on
Agreement: 99%share of analyses that agreed
Analyses: 153people who ran the extractor
One beat: 406milliseconds, 60,000 ÷ BPM
Tuning: 443.1Hz · +12 cents from A 440
Dynamics: 6.37dB the level wanders from its average
Loudness: 0.519Essentia's 0–1 scale, not dB
Danceability: 0.942Essentia'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

153 independent analyses of this recording were submitted to AcousticBrainz. All but a handful of them — 99% — put it in B flat major, a key signature of 2 flats. The tempo printed above is the median of the 153 readings; 100% of them land within 2% of it, and the middle eight tenths of them run from 147 to 148.1 BPM.

At 147.8 BPM one beat lasts 406 milliseconds, so a sixteenth note is 101.5 ms and a dotted eighth 304.5 ms — the delay times for this recording. Counted half as fast it is 73.9 BPM, counted twice as fast 295.6. A score would mark that Allegro, by the ranges this site uses.

The analyses put the reference pitch of the recording at 443.1 Hz, which is 12 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 6.37 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 0.519 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 B 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 B♭ major

Each of these differs from B♭ 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 148 BPM

Note value	Beats	Milliseconds	Hertz
Whole note	4	1623.8	0.62
Half note	2	811.9	1.23
Dotted quarter	1.5	608.9	1.64
Quarter note (one beat)	1	406	2.46
Quarter triplet	0.667	270.6	3.7
Dotted eighth	0.75	304.5	3.28
Eighth note	0.5	203	4.93
Eighth triplet	0.333	135.3	7.39
Dotted sixteenth	0.375	152.2	6.57
Sixteenth note	0.25	101.5	9.85
Sixteenth triplet	0.167	67.7	14.78
Thirty-second note	0.125	50.7	19.71

Half time 73.9 BPM · double time 295.6 BPM. Every row is one beat (406 ms) times the fraction in the second column.

Closest in key and tempo

Recordings in B flat major, ordered by how near their tempo is to 148 BPM. A calculation, not a recommendation.

All songs in B flat major All songs at 148 BPM B♭ major at 140–149 BPM Janis Joplin

MusicBrainz collapses 7 recording ids into this one. Recording id b9039a6d-5de5-4b47-8fa9-0874391cf18d.