I have just started this book and feel compelled to report I have already had the eureka moment other readers have described in terms of "groking" the logic behind playing up and down the neck of the guitar. I have been "noodling around" on the guitar for many years, as an amateur I hasten to add, and finally, seem to have found a method, a concept, that will move me beyond rote memorization of chord forms and lead patterns. I'll extend this review when I have finished the book. ( )