How To Mix In Key "Harmonic Mixing" | Understanding "Music Keys" for Effective Dj Mixing

How To Mix In Key "Harmonic Mixing" | Understanding "Music Keys" for Effective Dj Mixing.
This makes it easy for "Virtual DJ", "Serato Dj" , "RecordBox Dj" users
with a Simple Step By Step Guide Practical Explanation of the Key of a track, and its relationship with "Harmonic Mixing".
This video Also Explains the Relations/Differences between the key of a Track and that of the key of melody and how it affects your mix.