I highly recommend these two books:
A book written by Michael Nyman (a great composer himslef):
Great read not only because of the historical perspective, but also (perhaps even mainly) because it's full of great ideas, formal/conceptual strategies and approaches to music. Definitely a kind of mind opening book.
Awesome dictionary-style exploration of multidisciplinary understanding of sound concepts:
This may be the only book I ever read that is organized like an encyclopedia/dictionary, but is worth reading straight through. Full of amazing new ideas, and also worth reading as a way of expanding the understanding of familiar sonic concepts (like for example, delay, reverb etc.) considered from different vantage points: likeliterature, architecture, psychology, physiology, etc.
and you get to learn what sharawadji is