Think and Grow Rich-The African American version written by Napoloeon Hill's protege Dennis Kimbro. I aint ever been the same since I read that book.It opened my mind up to a whole other level. Unfortunately I outgrew most of my homies after adapting that approach to life. I recommend it to any minority interested in becoming an entrepreneur. He took Napoloen Hill's principles and expanded upon it.If you're not a minority-cop Think and Grow Rich by Napoleon Hill.
I dont know if anyone mentioned it earlier but Arnold Schoenberg's
"Fundamentals of Musical Composition" is a must read emphasizing on the classical side.A more easy to follow read would be the ravenspiral guide which i think is available for free online.
Something that I would recomend is "All You Need To Know About The Music Business" By: Donald S. Passman 6th edition. Its been re-published so many times since new things are happening in todays music. This book basically deals with everything that you do need to know.