It's an aesthetic thing. Kind of like pornography - I know it when I see/hear it...

...I've often felt maturity in music to mean that the music doesn't rely on impressing, inspiring or evoking emotion within the listener, but, um, allowing them the opportunity to do these things themselves if they truly try.

There isn't a black and white definition of almost anything. Even "is" is open to interpretation according to one U.S. president.

I don't understand the relevance of referencing a U.S. president...I mean, for starters it's like saying "no, but my dad says..." and, as such, holds no weight at all (no quote does when speaking of matters such as these), but, um...couldn't you have at least quoted a philosopher or lexicographer of some variety? *Some* sort of research or even an interest in the subject, as opposed to what some chap just happens to have thrown out there one day, would lend credit to the arguments of the speaker. Of course there are black and white definitions of plenty of things; look in a dictionary. *Loads*...now if you're trying to discern a true definition, to distil the essence of what inherently a word is, to encapsulate all its possible permutations and prevailing traits is absolutely possible, it merely requires you take a definition in a flux, not static, variant. I mean, um, for example, what *is* a stone weight-wise? You could say it's fourteen pounds, or use Avogadro's constant to find the number of atoms of any element you so wish to comprise that amount, but it won't tell you what *it* actually is...but...um...that's where you have to realise a static definition is, essentially, wrong and useless; even the language used to define things changes and, as such, we must expect definitions to be fluid, to be relative to each other; even time and space are mere referential factors...to state a definition isn't black and white is to say the colours black and white (being related to their properties of blackness and whiteness only through their ability to be relatively determined, not defined) aren't black and white...sorry, that sounds like I had a massive go but ensure yourself I don't intend to It's just...um...things like this are...well, kind of my thing... Oh, and of course I would say emotion is the most important goal of music...but doesn't that only suggest that maturity *isn't* the most important aspect a piece can have, thereby removing it from having a *direct* impact on the emotive force involved? Just a thought...
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You've mentioned before of your inability to suffer fools gladly. I trust you haven't read that much of Thomas Bernhardt if that sized "paragraph" put you off...that's a shame; he's actually a terribly good author.

I think that sized paragraph would be a turn off for most readers. Both visually and in terms of understanding, it poses big problems for the reader. I suppose a writer of fiction can adopt that as part of his style, but I can't imagine a teacher(of anything except creative writing) or employer who would approve of it.