Daft Punk · TRON: Legacy (Original Motion Picture Soundtrack)
Castor
Castor is in B flat major at 117.6 beats per minute.
Tempo
118 BPM · Moderatomedian of 176 analyses · 117–117.6 across the middle eight tenths- Key
- B♭ major2 flats · the key most of the analyses agreed on
- Agreement
- 97%share of analyses that agreed
- Analyses
- 176people who ran the extractor
- One beat
- 510.2milliseconds, 60,000 ÷ BPM
- Tuning
- 434.2Hz · -23 cents from A 440
- Dynamics
- 2.49dB the level wanders from its average
- Loudness
- 0.968Essentia's 0–1 scale, not dB
- Danceability
- 1.019Essentia'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
176 independent analyses of this recording were submitted to AcousticBrainz. All but a handful of them — 97% — put it in B flat major, a key signature of 2 flats. The tempo printed above is the median of the 176 readings; 100% of them land within 2% of it, and they barely differ at all.
At 117.6 BPM one beat lasts 510.2 milliseconds, so a sixteenth note is 127.6 ms and a dotted eighth 382.7 ms — the delay times for this recording. Counted half as fast it is 58.8 BPM, counted twice as fast 235.2. A score would mark that Moderato, 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 2.49 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 0.968 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 118 BPM
| Note value | Beats | Milliseconds | Hertz |
|---|---|---|---|
| Whole note | 4 | 2040.8 | 0.49 |
| Half note | 2 | 1020.4 | 0.98 |
| Dotted quarter | 1.5 | 765.3 | 1.31 |
| Quarter note (one beat) | 1 | 510.2 | 1.96 |
| Quarter triplet | 0.667 | 340.1 | 2.94 |
| Dotted eighth | 0.75 | 382.7 | 2.61 |
| Eighth note | 0.5 | 255.1 | 3.92 |
| Eighth triplet | 0.333 | 170.1 | 5.88 |
| Dotted sixteenth | 0.375 | 191.3 | 5.23 |
| Sixteenth note | 0.25 | 127.6 | 7.84 |
| Sixteenth triplet | 0.167 | 85 | 11.76 |
| Thirty-second note | 0.125 | 63.8 | 15.68 |
Half time 58.8 BPM · double time 235.2 BPM. Every row is one beat (510.2 ms) times the fraction in the second column.
Closest in key and tempo
- Another Lonely DayBen HarperB♭ major118BPM
- MaybelleneChuck BerryB♭ major117BPM
- Killer QueenQueenB♭ major118BPM
- Without YouMötley CrüeB♭ major118BPM
- Blue JeansLana Del ReyB♭ major118BPM
- ThirteenBig StarB♭ major118BPM
- I Don’t Like It, I Love ItFlo Rida feat. Robin Thicke & Verdine WhiteB♭ major118BPM
- Not in LoveEnrique Iglesias feat. KelisB♭ major117BPM
- Time (Clock of the Heart)Culture ClubB♭ major117BPM
- Talkin’ World War III BluesBob DylanB♭ major117BPM
Recordings in B flat major, ordered by how near their tempo is to 118 BPM. A calculation, not a recommendation.
All songs in B flat majorAll songs at 118 BPMB♭ major at 110–119 BPMDaft Punk
MusicBrainz collapses 2 recording ids into this one. Recording id d253e814-a07e-4d7e-bbc2-bac6d86645c0.