But step back a little and you will see that most artists use an at least rudimentary knowledge of music in order to succeed. Prince has had a long and successful career based on his ability to play many instruments and the undoubted insight it has given him. Taking it away a step to DJs and it is a fact that while many may be able to beat-match if the tracks you are mixing are in opposing keys the result will sound like a catfight. A basic knowledge of notation…