Behavioral analysis and measurement methods Book

This book was the first book I've ever read that touched on this topic, and at first reading in 2014 I was nodding my head till the end as I could relate to almost topic discussed. I re-read this book again this year, and while still agreeing with every point it made, I began to notice the aspects that were consciously excluded from the analysis and discussions as it was decided that they 'lie at the edges of the book's central concerns' (p. 12). I find myself constantly agreeing and yet at the same time constantly wondering if those aspects had bearings on the findings presented. Nonetheless, the aim of the book is to discuss how popular musicians learn, not why they learnt in a certain way (even though I believe answering the 'why' would make the 'how' more meaningful), and in that light, this book did answer the questions it put forth, and for anyone interested in this topic, this is not only a book worth reading, but the one you should start with.