no this is pretty interesting. and I was actually going to make a similar thread.
to continue on my Marxist critical path:
the factors which determine one's musical preferences are less individual/personal, and more economic. in other words, the kind of music one likes is less telling of one's personality per se, than one's upbringing and social status.
the neighborhood you were raised and live in; the education level of your parents; the kind of kids you grew up with; what you do for a living; how much you make; and maybe most important -- how much leisure time you have
these things explain what you listen to FAR more than some nebulous romantic idea of "personality".
and under what circumstances one is able to listen is also a big one: for instance because I do graphics, I've got my head-phones on all day, every day -- the long periods of sustained listening leading to an appreciation of things like Avant Classical or Clicks'n'Cuts.
whereas if I worked with people, I would only have time for music when I'm off, and depending how annoying are the people I work with, I might use music to blow off some steam - in which case I would not have the time or patience for Micro-Sound or Minimalism.
people who have superficial relationships to music, i.e. people who listen to obvious artists on commercial radio, like what they like because it's available to them. and if given more time, they would have the chance to delve deeper.
but ofcourse it's more complex than that -- economics might not COMPLETELY explain how happy or how miserable your teenage years were. and one's neural chemical make up surely does have an effect on what you buy from Amazon.com
Dont know about the rest of yer post though...