Song Key Finder + Camelot Wheel — Key Over Time, No Upload

Drop a track and you get the key (say E minor) with its Camelot code (9A) — the notation DJs use for harmonic mixing — plus an honest confidence badge. Because a full mix can sit between a key and its relative or parallel (the same seven notes wear two names), the tool always offers the runner-up instead of pretending there’s only one. Low confidence isn’t hidden: you can set the key by ear from the dropdown, and the Camelot wheel shows exactly where your key — and its neighbours — sit.

A single key label quietly lies the moment a song changes key. So the tool paints a key over time strip under the waveform, each section coloured by its key. A song in one key is one calm band — a strong sign the key holds. An intro in a different key, a modulating bridge, a key change for the last chorus — they show up as their own bands, and the read-out says the key moves instead of forcing one label. Hover anywhere to read the key at that moment. (Relative/parallel wobble is collapsed on purpose, so a steady track stays steady and only a real move registers.)

The Camelot wheel turns key signatures into clock positions so you don’t need to read music to mix in key. Two rules cover almost everything:

Key detection’s classic trap is two keys that aren’t really wrong, just differently named. On a dense mix they score within a hair of each other, so the tool names the runner-up and lets your ear settle it instead of flipping a coin.

In Camelot terms the relative is same number, switch letter (8A ⇄ 8B); the parallel keeps the tonic but flips the mood. When the runner-up is the relative, the page says so — that’s usually the one to trust if the headline feels off.

Most music is tuned to the A=440 Hz standard, but plenty isn’t: A=432 ("verdi"/"scientific" tuning), older records, tape that’s run slow or fast, a guitar tuned a touch flat. The tool reads the track’s tuning offset in cents, so a song sitting near A=432 shows roughly −32¢ instead of being forced onto the nearest standard key. A near-zero offset also confirms the analysis locked onto real pitched content rather than noise — handy before you trust the key at all.

Key tells you what mixes harmonically; tempo tells you what mixes rhythmically. Once you have the key here, grab the tempo with the BPM Finder — same no-upload, in-browser analysis, with a tempo-over-time curve. Together they cover both axes of harmonic mixing and remix planning.