SessionKey
Song Key Analyser
Put it on the master and know your key. SessionKey detects the song's key live while you play — or instantly from a dropped bounce — and shows its verdict on a glowing circle of fifths with an honest confidence score. Camelot notation for DJs, the tuning offset in cents, the live chromagram it decided from, the diatonic chords of the key, and a timeline of every modulation in the song.
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SessionKey in Detail
Technical Capabilities
Circle-of-fifths display: the detected key glows, its relative and harmonic neighbours light up around it
Two timescales, like a loudness meter: RIGHT NOW (sliding window, catches modulations) and WHOLE SONG (integrated verdict)
Honest confidence: every answer carries a percentage — low certainty is admitted, never bluffed
Drop a bounce anywhere on the window for an instant whole-file answer — no playback needed
KEY TIMELINE: the song's key over time as coloured segments — every modulation at a glance
Tuning detection: the song's actual reference pitch estimated to the cent from interpolated spectral peaks
Camelot wheel notation (4A / 8B) built in for DJ workflows
Chromagram view: the 12 pitch-class energies the verdict is based on, key tones highlighted
CHORDS IN KEY: the seven diatonic chords of the detected key with roman numerals
Bass-weighted, tuning-aware analysis (Krumhansl-Schmuckler profiles) — natural minor is not misread as its relative major
Pure passthrough analyser: zero latency, zero coloration, safe on the master