There are multiple aspects of scoring covered in the book. From structure, to approach, to attitude, to instinct. It's a skill that is never truly mastered as you can assume since music is so subjective. What did Tupac say again? He was discovered by the very young daughter of a top music executive. You never know who decides on what is bought on a commercial, a film or tv show, but you have to please the right people even when you don't know who the "right people" are.
Once reading the chapter you will have a great idea how to get it done.
The 30-30