Key
The key of a track — which notes dominate.
Detailed explanation
The key describes which notes mainly occur in a track. There are 12 root notes, each as major (sounds “bright”) or minor (sounds “dark”) — 24 possible keys. It matters to DJs because tracks in incompatible keys sound dissonant together. rekordbox analyses the key automatically and shows it in Camelot notation (1A–12B).
In practice
The key sits next to the BPM in most DJs' libraries, and it usually gets used too late. It is useful not while mixing but while preparing: if you know which tracks fit together, you no longer have to guess in the booth. Do not trust the analysis blindly — on tracks with little melody or a strong vocal, automatic detection is regularly wrong.
Assessment by the DJLearn editorial team — experience, not a sourced factual claim.
Related terms
Where to learn this
Harmonic mixing
The guide that covers this topic in depth.
Explained in this phase
Phase 9: Harmonic Mixing — Key & Scales
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