Having long been aware of Thomas Mann's famous description of Schoenberg's writing - which was apparently taken largely from Adorno - I found Kundera's writing about modern music exciting and insightful. From The Book of Laughter and Forgetting:
"This is what my father told me when I was five: a key signature is a king's court in miniature. It is ruled by a king (the first step) and his two right-hand men (steps five and four). They have four other dignitaries at their command, each of whom has his own special relation to the king and his right-hand men. The court houses five additional tones as well, which are known as chromatic. They have important parts to play in other keys, but here they are simply guests.
Since each of the twelve notes has its own job, title, and function, any piece we hear is more than mere sound: it unfolds a certain action before us. Sometimes the events are terribly involved (as in Mahler or - even more - Barók or Stravinsky): princes from other courts intervene, and before long there is no telling which court a tone belongs to and no assurance it isn't working undercover as a double or triple agent. But even then the most naive of listeners can figure out more or less what is going on. The most complex music is still a language.
That is what my father told me. What follows is all my own. One day a great man determined that after a thousand years the language of music had worn itself out and could do no more than rehash the same message. Abolishing the hierarchy of tones by revolutionary decree, he made them all equal and subjected them to a strict discipline: none was allowed to occur more often than any other in a piece, and therefore none could lay claim to its former feudal privileges. All courts were permanently abolished, and in their place arose a single empire, founded on equality and called the twelve-tone system.
Perhaps the sonorities were more interesting than they had been, but audiences accustomed to following the courtly intrigues of the keys for a millennium failed to make anything of them. In any case, the empire of the twelve-tone system soon disappeared. After Schönberg came Varèse, and he abolished notes (the tones of the human voice and musical instruments) along with keys, replacing them with an extremely subtle play of sounds which, though fascinating, marks the beginning of the history of something other than music, something based on other principles and another language."
More from this soon.