Harmonic mixing is the natural evolution of beat mixing: mixing in compatible keys. You can now avoid sour mixes caused by clashing melodies. You can mix long overlays without depending on percussion "free beats." You can achieve those "screamer mixes" which provide the ultimate DJ rush! From harmonic-mixing.com
Here is a harmonic keys overlay chart. (For manual harmonic mixing.)
Acoustica's DJ Twist & Burn software supports automatic harmonic mixing!
Each song is transposed by matching the key, the perfect fourth, perfect fifth or relative minor or major of the previous songs. This method results in +/- 2 semitone transpositions at most.
If you don't have DJ Twist & Burn, download our dj software here!