Metal, Classical, (true) Folk music, etc. = impersonal
Other music (Pink Frothy Aids and 'core included) = personal
This one keeps coming back to hit me in various forms. Metal is pulling back from the individual to see the big picture; pop music is making the individual into the big picture (solipsism, narcissism and eventually, fatalism because there is nothing beyond the self).
I like the metal viewpoint. Pop music always struck me as too much like advertising, since it placates me and panders to me without urging me on to better, more effective actions like my best teachers and coaches. Sounds trite but it's true.