TempoPeek

Christina Perri · Lovestrong.

Jar of Hearts

Jar of Hearts is in E flat major at 148.2 beats per minute.

4080120160200

Tempo

148 BPM · Allegromedian of 163 analyses · 147.7–148.6 across the middle eight tenths
Key
E♭ major3 flats · the key most of the analyses agreed on
Agreement
100%share of analyses that agreed
Analyses
163people who ran the extractor
One beat
404.9milliseconds, 60,000 ÷ BPM
Tuning
439.2Hz · -3 cents from A 440
Dynamics
3.33dB the level wanders from its average
Loudness
0.75Essentia's 0–1 scale, not dB
Danceability
0.98Essentia'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

163 independent analyses of this recording were submitted to AcousticBrainz. All but a handful of them — 100% — put it in E flat major, a key signature of 3 flats. The tempo printed above is the median of the 163 readings; 100% of them land within 2% of it, and they barely differ at all.

At 148.2 BPM one beat lasts 404.9 milliseconds, so a sixteenth note is 101.2 ms and a dotted eighth 303.6 ms — the delay times for this recording. Counted half as fast it is 74.1 BPM, counted twice as fast 296.4. A score would mark that Allegro, by the ranges this site uses.

The analyses put the reference pitch of the recording at 439.2 Hz, which is 3 cents below 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 3.33 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 0.75 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 E 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 E♭ major

Each of these differs from E♭ 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 valueBeatsMillisecondsHertz
Whole note41619.40.62
Half note2809.71.23
Dotted quarter1.5607.31.65
Quarter note (one beat)1404.92.47
Quarter triplet0.667269.93.71
Dotted eighth0.75303.63.29
Eighth note0.5202.44.94
Eighth triplet0.3331357.41
Dotted sixteenth0.375151.86.59
Sixteenth note0.25101.29.88
Sixteenth triplet0.16767.514.82
Thirty-second note0.12550.619.76

Half time 74.1 BPM · double time 296.4 BPM. Every row is one beat (404.9 ms) times the fraction in the second column.

Closest in key and tempo

  1. Do You Want to Build a Snowman?Kristen Bell, Agatha Lee Monn and Katie LopezE♭ major148BPM
  2. RiversAllman BrownE♭ major148BPM
  3. IsisBob DylanE♭ major148BPM
  4. All My LifeLinda Ronstadt & Aaron NevilleE♭ major148BPM
  5. Under African SkiesPaul SimonE♭ major149BPM
  6. ¿Y tú qué has hecho?Buena Vista Social ClubE♭ major147BPM
  7. End of the RoadBoyz II MenE♭ major150BPM
  8. Don’t Stop5 Seconds of SummerE♭ major150BPM
  9. The Well and the LighthouseArcade FireE♭ major150BPM
  10. Starry EyedEllie GouldingE♭ major150BPM

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

All songs in E flat majorAll songs at 148 BPME♭ major at 140–149 BPM

MusicBrainz collapses 5 recording ids into this one. Recording id 5e00974d-b75a-429f-b01a-2b9283f3fb31.