What key is this song in?
Drop a track and get its most likely key — with the Camelot code for harmonic mixing, the close alternatives, and a confidence chip that tells you how much to trust it.
Nothing is uploaded — your audio never leaves your device.
One key per song is a guess. Your library deserves the truth.
Chromagram matching mistakes relatives and modes — every free detector does. BPMandKey in the studio runs deeper analysis across your whole library and saves every result with Camelot codes. Sign up: 3 full packs free.
Frequently asked questions
How does the key finder work?
It builds a chromagram — how much energy lands on each of the 12 pitch classes — and correlates it against the classic Krumhansl-Schmuckler major and minor profiles. The best-matching rotation is your key; the margin over second place is the confidence.
What is a Camelot code?
A DJ-friendly relabeling of keys as positions on a wheel (8B = C major, 8A = A minor). Neighboring codes mix harmonically, so '11B' tells you instantly what blends with it. We show it next to every result.
Why does it say my minor song is in the relative major?
Relative keys share every note — C major and A minor have identical chromagrams apart from emphasis. That's the known failure mode of template matching, which is why the alternatives list and confidence chip are always shown.
Does key detection work on full mixes?
Yes, that's what it's built for — though heavy percussion dilutes the tonal evidence. Confidence above 0.5 on a full mix is a solid read; below 0.3, trust your ears or the studio's deeper pass.