Ah, Luigi Nono is one composer I haven't yet really come to love, hopefully I will soon seeing that his music is much admired here! Any recommendations as to where to start?
If I were you, I'd go straight to
Prometeo - Tragedia dell'ascolto. I recommend this recording (altough a live/staged experience could be a lifetime one)
The second part of the title (tragedy of listening) is almost always omitted, but is the true key of this masterpiece
If "it clicks" for you, you are going to be a Nonian for the rest of your life

PS thanks for you very interesting review of Mahler 7 with Chailly.