I have plenty of books and dvds and I have realized that I have learned the same from this forum than learning from books. As Galper says, if a book teach you only one thing, it is a good book; but books often try to make a rule from the random.
Take for example Baker's books, they are very good, but I think none of the greats is playing thinking where to put those extra chromatics, They were feeling the beat, looking for the sweet notes, expressing a feeling, hearing themselves.
I heared sometime ago a good sentence: I you want to be free, learn to be constrained; that cost me no money

, but it is difficult to go from practice to playing with all that info in your mind.
May be I am wrong but I think the strong point about Harris' method is to go to his rehearsals, to be able to hear what He is saying to you, just like a band use to train.
The ones without musical environment have to rely on books; it is a pity.
It is always the same process repeating. You feel you need something more, and that new book is gone to tell you the truth who will convert you in the next Bird, but this new book is only telling you the same thing than the previous but from other point of view: hit the changes at the strong beat, hit the changes at the weak beat, play arps from the 3rd to the b9 going to the 5,..., and then you have studied five superbooks and you don't know to play Happy Birthday by ear.
Music is my only teacher now.
Tone KIng Imperial Preamp
Today, 08:47 PM in Guitar, Amps & Gizmos