Complex Solution
30s preview
- BPM
- 138
- Open Key
- 10d
- Energy
- 100/100
- Pop
- 9/100
- Length
- 2:47
- Released
- 2020
- Genre
- Trance
- Loudness
- -7.5 dB
- Dynamics
- 11.9 dB
- ISRC
- NLD682003145
Key, BPM and audio features: model-based audio analysis · how we measure · catalogue updated July 2026
Complex Solution runs 138 BPM in E♭ major (5B), a driving up-tempo trance record. The feel is punchy, neutral in mood. The mix is almost entirely instrumental. Its spectrum is weighted to the sub and kick, with a heavy low end. The master keeps unusual dynamic range for club music (crest 12 dB). Hotter than 97% of John O'Callaghan's catalogue.
Sonic profile
Frequency spectrum
amplitude · bass → treble
- 33%
- Low
- 30-130 Hz
- 27%
- Low-mid
- 130-570 Hz
- 22%
- Upper-mid
- 570 Hz-2.5 kHz
- 19%
- High
- 2.5-11 kHz
FAQ
What key is Complex Solution in?
Complex Solution by John O'Callaghan is in E♭ major, or 5B on the Camelot wheel.
What BPM is Complex Solution?
Complex Solution runs at 138 BPM, a driving up-tempo track.
What mixes well with Complex Solution?
From 5B it blends harmonically with 6B, 5A, 4B. Moving to 6B lifts the energy a step.
Is Complex Solution good for peak time?
With energy 100 out of 100 at 138 BPM, it works best as a peak-time weapon.
Mixes harmonically
5B → 4B · 6B · 5AFrom 5B, 6B (B♭ major) lifts the energy a step; 5A (C minor) settles into the relative minor; 4B (A♭ major) cools the energy down a step.
How to mix it
In 5B at 138 BPM: 6B (B♭ major) — move to 6B to push the floor harder; 5A (C minor) — switch to 5A for a mood change without losing the groove; 4B (A♭ major) — drop to 4B to bring the room down gently.
Pitch range at ±6%: 130-146 BPM — anything in that window beatmatches without sounding stretched.
Key on the fader: without key lock (Master Tempo on CDJs), above roughly +5% it plays a semitone higher, so treat it as 12B rather than 5B; below -5% it reads as 10B. With key lock on, it stays 5B across the whole range.
Programming: a peak-time weapon — save it for the main stretch (energy 100/100).
Similar tempo
Within ±3 BPM of 138 — beatmatch without a big tempo pull.
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Other recommendations
Beyond strict key and genre matches: tracks that still sit in beatmatch range of 138 BPM with a compatible energy and groove — candidates for a key jump or a genre crossover.
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