Traditional Methods
A commonly-known method of using harmonic mixing is to detect the root key of every music file in the DJ collection by using a piano. The root key that fits the track perfectly may be used to create harmonic mash-ups with other tracks in the same key. The root key is also considered compatible with the subdominant, dominant and relative major/minor keys.
A more advanced harmonic mixing theory has been proposed which accounts for the various modes as well (aeolian, ionian, lydian, mixolydian, dorian and phrygian). It is shown that these alternate modes can be seen as variations of the traditional major and minor keys, and that they can be translated to traditional keys via the Circle of Fifths.
Which notes are in the scale is much more important than which is the tonic, so these can be converted to one mode, such as minor. For example F lydian and B locrian contain the same notes as A minor, so these should be compatible, and slightly less with D minor and E minor.
Read more about this topic: Harmonic Mixing
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