Key detector.

It listens to the whole file, not a snippet. Every note between C2 and C7 is folded into one of the twelve pitch classes, each moment counted equally so a loud chorus does not outvote the verses, and the twelve totals are compared with the shapes of all 24 major and minor keys (the Krumhansl and Kessler profiles, from listening experiments on which notes feel at home in a key). The best fit is the key, and the percentage is how well it fits: around 90% for a song that sits clearly in one key, under 60% for one that does not.

They share every note, so the notes alone cannot decide; what decides is which chord feels like home, the one the song keeps landing on. Press play, choose Home chord, and switch between the two keys: the right one blends in and the song settles onto it at the ends of phrases; the wrong one sounds like it is waiting for something. The runner-up key is usually this relative, or the key a fifth away, which shares six of seven notes.

They are the keys a DJ can mix into without a clash. The Camelot wheel numbers the 24 keys so that one number up or down is a fifth away (one note different), and the same number with the other letter is the relative key (no notes different). From 8A, A minor, the safe moves are 8A, 7A (D minor), 9A (E minor) and 8B (C major). The list on this page can sort a whole session that way, so neighbours mix into each other.

Usually for one of four reasons. It picked the relative key, which has the same notes. It picked a neighbour a fifth away, often because the hook leans on that chord. The song is modal, a Dorian or Mixolydian groove that is neither plainly major nor minor, so every detector has to force it into one. Or the recording is not tuned to A = 440: this page only counts energy within about a third of a semitone of each note, so a track tuned a quarter-tone off reads poorly everywhere. The fit percentage drops in all four cases, which is the hint to check by ear.

Yes. Search it by name and the 30 second preview that music stores publish is read instead. Thirty seconds is usually enough, but a preview is often the chorus, and a chorus that sits on the relative chord or changes key reads less surely than the whole song.

Yes. Choose Add several files, or drop a handful or a whole folder's worth on the page. They are read one after another, each joins the session list with its key, Camelot code, how sure the reading is and the tempo, and By Camelot orders the list for a set. The list stays in the tab; nothing is saved anywhere.

Use the audio speed changer: it moves a song up or down by semitones and keeps the tempo, or changes the tempo and keeps the key. Moving a song more than two or three semitones starts to change the character of voices, so for a big change it is often better to pick a different capo or a transposed backing track.

No. The file is decoded and read in your browser and never leaves your device. Only a song search goes through our server, and what it sends is the title you typed, to fetch the store preview.