Miles Davis · 'Round About Midnight

The Theme

The Theme is in B flat major at 135.9 beats per minute.

4080120160200

Tempo

136 BPM · Allegromedian of 156 analyses · 99.2–172.3 across the middle eight tenths
Key
B♭ major2 flats · the key most of the analyses agreed on
Agreement
22%share of analyses that agreed
Analyses
156people who ran the extractor
One beat
441.5milliseconds, 60,000 ÷ BPM
Tuning
441Hz · +4 cents from A 440
Dynamics
6.41dB the level wanders from its average
Loudness
0.216Essentia's 0–1 scale, not dB
Danceability
1.017Essentia'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

156 independent analyses of this recording were submitted to AcousticBrainz. Fewer than half of them — 22% — put it in B flat major, a key signature of 2 flats. The tempo printed above is the median of the 156 readings; 19% of them land within 2% of it, and the middle eight tenths of them run from 99.2 to 172.3 BPM. That is a recording the detector cannot settle on — the readings are spread far enough that the median is a summary of a disagreement rather than a measurement anybody should trust to the decimal.

At 135.9 BPM one beat lasts 441.5 milliseconds, so a sixteenth note is 110.4 ms and a dotted eighth 331.1 ms — the delay times for this recording. Counted half as fast it is 68 BPM, counted twice as fast 271.8. A score would mark that Allegro, by the ranges this site uses.

The analyses put the reference pitch of the recording at 441 Hz, which is 4 cents above concert A at 440 Hz — close enough to standard that a tuner would not argue. That is a fact about this transfer of the music, not about how it was played.

The dynamic complexity of the recording measures 6.41 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 0.216 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 136 BPM

Note valueBeatsMillisecondsHertz
Whole note417660.57
Half note28831.13
Dotted quarter1.5662.31.51
Quarter note (one beat)1441.52.27
Quarter triplet0.667294.33.4
Dotted eighth0.75331.13.02
Eighth note0.5220.84.53
Eighth triplet0.333147.26.8
Dotted sixteenth0.375165.66.04
Sixteenth note0.25110.49.06
Sixteenth triplet0.16773.613.59
Thirty-second note0.12555.218.12

Half time 68 BPM · double time 271.8 BPM. Every row is one beat (441.5 ms) times the fraction in the second column.

Closest in key and tempo

  1. HonestyBilly JoelB♭ major136BPM
  2. What You Waiting For?Gwen StefaniB♭ major136BPM
  3. RoxanneThe PoliceB♭ major136BPM
  4. HumanThe KillersB♭ major136BPM
  5. DebaserPixiesB♭ major136BPM
  6. Rocket Man (I Think It’s Going to Be a Long, Long Time)Elton JohnB♭ major137BPM
  7. Hotline BlingDrakeB♭ major135BPM
  8. Se a caboSantanaB♭ major137BPM
  9. Evil Woman (Don’t Play Your Games With Me)Black SabbathB♭ major137BPM
  10. Green OnionsBooker T. & the MG’sB♭ major137BPM

Recordings in B flat major, ordered by how near their tempo is to 136 BPM. A calculation, not a recommendation.

All songs in B flat majorAll songs at 136 BPMB♭ major at 130–139 BPMMiles Davis

MusicBrainz collapses 35 recording ids into this one. Recording id 762a28b6-b3fc-4a95-a66c-c65e96cdcc6f.