This book is an absolute MUST READ for any musician, as it experiences a way of life through musical practice, from a Zen philosophy point of view. No religion here, no proselytism, just a point of view which helped me opening eyes, and made me a better person and musician too.
This book will not teach you any technic, notes, or other musical features, but propose a state of mind in order to play music (and live) better. This book makes you think about why you are playing music, not how.