SonodexHow to read the wheel
Each of the 24 keys gets a code from 1A to 12B. Examples: 8A is A minor, 8B is C major, 5A is C minor. The numbers are arranged in a circle, B codes on the outside, A codes on the inside.
The notation comes from the Mixed In Key software, but is available as a display in almost every DJ program. Alternatively there is “Open Key”, which does the same in a different notation.
The three safe moves
From a track with the code 8A you get harmonically to: 8A (same key), 9A or 7A (one number up or down, same letter) and 8B (same number, different letter: the relative major).
You try further jumps by ear, because rules on paper are no substitute for it.
Limits
The codes only say something about root notes, not about melodies, chords or vocals. Two tracks with neighbouring codes can still sound off if both play dominant melodies. Short transitions of 16 to 32 beats are safer.
In practice: an example mix
Your current track is at 8A (A minor). Next, 8A, 7A, 9A and 8B fit. You choose 9A because you want a touch more tension. After that, 10A or 9B would work. Write down your favourite routes once and you will soon have your own map through your repertoire.
What matters is the order of decision: tempo and energy first, then key as the finishing touch. A harmonically matching track that falls flat on energy will not save a set.
Related terms
Frequently asked questions
What does 8A mean?
8A stands for A minor. The number is the position on the wheel, A means minor, B means major.
Is Camelot the same as the circle of fifths?
It is based on it. The wheel simply numbers the keys so that neighbours in the circle are also harmonic neighbours.