The blurb in my edition starts: "What would cause a 55-year old white male, neither lean nor hungry, to embroil himself in the world of New Orleans rap, not merely as an observer, but as an active participant –ideas man, talent-spotter, lyricist, and would-be producer? And why did his experience, after many tribulations, end up so profoundly joyous and fulfulling?".
You'd have to read it to know both answers since the whole book revolves around answering them.
Keep in mind that his is not a well-rehearsed plan, you are just witnessing Nik Cohn's wandering around the broken-down slums with not a clue of what he's doing, but what a joy it is to tag along. Most of the time you can tell that he (Cohn AKA Triksta, Dreamshit, Mort Ziploc) is playing by ear and he almost spends more time in the funeral parlor, attending some rapper's wake, than in the rudimentary unprofessional studios where is supposed to make his magic (I'm afraid life expectancy in NOLA's projects is kind of low. As one of the rappers in this book puts it: "rap years is like dog years. That makes me an old dog") but that is the way Cohn works.
Unfortunately I've just learned (through Goodreads) that there is an edition of the book with an extra chapter on Katrina that is missing in mine edition, which had already gone to press when the hurricane struck. That makes me feel massively unfulfilled. I'll try to fix that and get back to you soon.