Formalized music Book

It's hard to rate this book really since I can't say I understand the math heavy sections, which is to say about 80% of the book. I very much like Xenakis' music as well as his general philosophy to music. My critique is the minimalist one, that I would prefer the music to demonstrate simply one mathematical concept in a audible way. In some of his pieces I hear the general concept being played out: sound clouds, sound masses evolving. But as a composer there are no techniques outlined here that I can use.