My daughter is a classical violinist--although she plays beautifully now, there were many younger years (at six years of age) of "peeling back the layers" so to speak--one's artistic journey is never truly finished. Indeed it is quite relevant for musicians as well as visual artists.
I too enjoyed the gamut analysis. It makes me want to go take a variety of the three primaries and make a bunch of charts so I can see all the possibilities. Quite scary this train of thought though, as I need to get outside more and put brush to canvas and get on with it all. *sigh* Sometimes I want to shush the left side.