Eagles · On the Border

Ol’ 55

Ol’ 55 is in C major at 70.8 beats per minute.

Tempo

71 BPM · Adagiomedian of 233 analyses · 70.6–70.8 across the middle eight tenths

Key: C majorno sharps and no flats · the key most of the analyses agreed on
Agreement: 100%share of analyses that agreed
Analyses: 233people who ran the extractor
One beat: 847.5milliseconds, 60,000 ÷ BPM
Tuning: 442.8Hz · +11 cents from A 440
Dynamics: 5.92dB the level wanders from its average
Loudness: 0.753Essentia's 0–1 scale, not dB
Danceability: 1.004Essentia'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

233 independent analyses of this recording were submitted to AcousticBrainz. All but a handful of them — 100% — put it in C major, a key signature of no sharps and no flats. The tempo printed above is the median of the 233 readings; 100% of them land within 2% of it, and they barely differ at all.

At 70.8 BPM one beat lasts 847.5 milliseconds, so a sixteenth note is 211.9 ms and a dotted eighth 635.6 ms — the delay times for this recording. Counted half as fast it is 35.4 BPM, counted twice as fast 141.6. A score would mark that Adagio, by the ranges this site uses.

The analyses put the reference pitch of the recording at 442.8 Hz, which is 11 cents above 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 5.92 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 0.753 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 C 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 C major

Each of these differs from C 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 71 BPM

Note value	Beats	Milliseconds	Hertz
Whole note	4	3389.8	0.3
Half note	2	1694.9	0.59
Dotted quarter	1.5	1271.2	0.79
Quarter note (one beat)	1	847.5	1.18
Quarter triplet	0.667	565	1.77
Dotted eighth	0.75	635.6	1.57
Eighth note	0.5	423.7	2.36
Eighth triplet	0.333	282.5	3.54
Dotted sixteenth	0.375	317.8	3.15
Sixteenth note	0.25	211.9	4.72
Sixteenth triplet	0.167	141.2	7.08
Thirty-second note	0.125	105.9	9.44

Half time 35.4 BPM · double time 141.6 BPM. Every row is one beat (847.5 ms) times the fraction in the second column.

Closest in key and tempo

Recordings in C major, ordered by how near their tempo is to 71 BPM. A calculation, not a recommendation.

All songs in C major All songs at 71 BPM Eagles

MusicBrainz collapses 12 recording ids into this one. Recording id 035494d9-f1ed-4013-b851-15d3512a774c.