Dana,

The music business itself now defies all rules and books written on the subject. It is sort of make it all up as you go along. There are not "single formats" anymore, they all sort of cross section each other. There are no more people that listen to "one type of music" so the old days of writing for a specific audience really doesn't apply. The old rules of money, approach, style, structure, etc. really don't hold up any more and no books can really keep up. Going to places like YOU TUBE, and other streaming services, can probably do you more good as to current educational aspects, and of course, the old days of being around like minded individuals are pretty much going to be the best way to bring your education up to whatever speed you can go.

The bottom line, what is the music business today? What you can make it.
MAB