2 Chainz feat. Travis Scott · Pretty Girls Like Trap Music
4 AM
4 AM is in B flat minor at 150.1 beats per minute.
Tempo
150 BPM · Allegromedian of 138 analyses · 150.1–150.1 across the middle eight tenths- Key
- B♭ minor5 flats · the key most of the analyses agreed on
- Agreement
- 100%share of analyses that agreed
- Analyses
- 138people who ran the extractor
- One beat
- 399.7milliseconds, 60,000 ÷ BPM
- Tuning
- 434.2Hz · -23 cents from A 440
- Dynamics
- 5.49dB the level wanders from its average
- Loudness
- 0.853Essentia's 0–1 scale, not dB
- Danceability
- 1.186Essentia'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
138 independent analyses of this recording were submitted to AcousticBrainz. All but a handful of them — 100% — put it in B flat minor, a key signature of 5 flats. The tempo printed above is the median of the 138 readings; 100% of them land within 2% of it, and they barely differ at all.
At 150.1 BPM one beat lasts 399.7 milliseconds, so a sixteenth note is 99.9 ms and a dotted eighth 299.8 ms — the delay times for this recording. Counted half as fast it is 75.1 BPM, counted twice as fast 300.2. A score would mark that Allegro, 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 5.49 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 0.853 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 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 B♭ minor
Each of these differs from B♭ 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 150 BPM
| Note value | Beats | Milliseconds | Hertz |
|---|---|---|---|
| Whole note | 4 | 1598.9 | 0.63 |
| Half note | 2 | 799.5 | 1.25 |
| Dotted quarter | 1.5 | 599.6 | 1.67 |
| Quarter note (one beat) | 1 | 399.7 | 2.5 |
| Quarter triplet | 0.667 | 266.5 | 3.75 |
| Dotted eighth | 0.75 | 299.8 | 3.34 |
| Eighth note | 0.5 | 199.9 | 5 |
| Eighth triplet | 0.333 | 133.2 | 7.51 |
| Dotted sixteenth | 0.375 | 149.9 | 6.67 |
| Sixteenth note | 0.25 | 99.9 | 10.01 |
| Sixteenth triplet | 0.167 | 66.6 | 15.01 |
| Thirty-second note | 0.125 | 50 | 20.01 |
Half time 75.1 BPM · double time 300.2 BPM. Every row is one beat (399.7 ms) times the fraction in the second column.
Closest in key and tempo
- HUMBLE.Kendrick LamarB♭ minor150BPM
- Bank Account21 SavageB♭ minor150BPM
- BanquetBloc PartyB♭ minor150BPM
- You & Me (Flume remix)Disclosure feat. Eliza DoolittleB♭ minor150BPM
- Good VibrationsThe Beach BoysB♭ minor151BPM
- VerifiedA$AP FergB♭ minor149BPM
- Blue HotelChris IsaakB♭ minor149BPM
- RevolutionShotgun MessiahB♭ minor148BPM
- DeucesChris Brown feat. Tyga & Kevin McCallB♭ minor148BPM
- Love Is BlindnessU2B♭ minor146BPM
Recordings in B flat minor, ordered by how near their tempo is to 150 BPM. A calculation, not a recommendation.
All songs in B flat minorAll songs at 150 BPMB♭ minor at 150–159 BPM
MusicBrainz collapses 1 recording id into this one. Recording id bfbe4297-9648-4bb5-ba58-651f0a3f6934.