Queen · A Night at the Opera
’39
’39 is in A flat major at 101.8 beats per minute.
Tempo
102 BPM · Andantemedian of 184 analyses · 101.7–104.6 across the middle eight tenths- Key
- A♭ major4 flats · the key most of the analyses agreed on
- Agreement
- 82%share of analyses that agreed
- Analyses
- 184people who ran the extractor
- One beat
- 589.4milliseconds, 60,000 ÷ BPM
- Tuning
- 434.2Hz · -23 cents from A 440
- Dynamics
- 4.25dB the level wanders from its average
- Loudness
- 0.582Essentia's 0–1 scale, not dB
- Danceability
- 1.131Essentia'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
184 independent analyses of this recording were submitted to AcousticBrainz. Most of them — 82% — put it in A flat major, a key signature of 4 flats. The tempo printed above is the median of the 184 readings; 87% of them land within 2% of it, and the middle eight tenths of them run from 101.7 to 104.6 BPM.
At 101.8 BPM one beat lasts 589.4 milliseconds, so a sixteenth note is 147.3 ms and a dotted eighth 442 ms — the delay times for this recording. Counted half as fast it is 50.9 BPM, counted twice as fast 203.6. A score would mark that Andante, 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 4.25 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 0.582 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 102 BPM
| Note value | Beats | Milliseconds | Hertz |
|---|---|---|---|
| Whole note | 4 | 2357.6 | 0.42 |
| Half note | 2 | 1178.8 | 0.85 |
| Dotted quarter | 1.5 | 884.1 | 1.13 |
| Quarter note (one beat) | 1 | 589.4 | 1.7 |
| Quarter triplet | 0.667 | 392.9 | 2.55 |
| Dotted eighth | 0.75 | 442 | 2.26 |
| Eighth note | 0.5 | 294.7 | 3.39 |
| Eighth triplet | 0.333 | 196.5 | 5.09 |
| Dotted sixteenth | 0.375 | 221 | 4.52 |
| Sixteenth note | 0.25 | 147.3 | 6.79 |
| Sixteenth triplet | 0.167 | 98.2 | 10.18 |
| Thirty-second note | 0.125 | 73.7 | 13.57 |
Half time 50.9 BPM · double time 203.6 BPM. Every row is one beat (589.4 ms) times the fraction in the second column.
Closest in key and tempo
- Another Day in ParadisePhil CollinsA♭ major102BPM
- Ce matin‐làAirA♭ major102BPM
- Beautiful GirlsVan HalenA♭ major101BPM
- Just for a ThrillRay CharlesA♭ major101BPM
- The Power of EqualityRed Hot Chili PeppersA♭ major103BPM
- Penny LoverLionel RichieA♭ major101BPM
- My MichelleGuns N’ RosesA♭ major103BPM
- Electric FeelMGMTA♭ major103BPM
- I Can’t Help ItMichael JacksonA♭ major100BPM
- In Too DeepGenesisA♭ major104BPM
Recordings in A flat major, ordered by how near their tempo is to 102 BPM. A calculation, not a recommendation.
All songs in A flat majorAll songs at 102 BPMA♭ major at 100–109 BPMQueen
MusicBrainz collapses 46 recording ids into this one. Recording id 16d2c90d-d688-4465-bb76-4a9e94b80729.