Ironmine,
I agree with you on the function of music, but the means of evoking the emotions are different for different people, and that's where listeners intellect comes into play, or it doesn't. It's just a conduit to our emotions.
I couldn't have said it better, than Parasound63
I don't think you would argue, that experiencing positive emotions from listening to Britney Spears vs. Mozart involves very different types of personality, hence intellect.
I'm happy, that Black metal helps you to have your emotional experiences. I cannot possibly claim the same- I experience nothing, but a repulsion. You sound like a very reasonable and well educated individual, and your affection with the genre double puzzles me.
As a side note- I respect complexity, talent and musicianship of Yes, and I've been to their concert (with Rick Wakeman), but I could never connect emotionally to their music neither.
Black Metal, though is a whole different story... But let me stop here.