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Unfortunately, I was wrong. The book isn't written to help the complete novice learn how to play the guitar. It's actually partly anecdotal pep-talk by author Gary Marcus— on how after years of sucking at all things musical he finally learned how to play guitar— and partly about the neuroscience that allows any of us to be musical at all. Since I am a fan of neuroscience, I was not completely disappointed by the lack of instruction in this book. It runs long for a pep-talk, and the gist of the brain science is this: There is no music-specific region of the brain, and practice makes perfect. That's pretty much it. I'd love to give more explicit details, but unfortunately it's been several months since I read it and I've already returned the book to the library. ... Oops. On the bright side, I can't really spoil it for you!
So this may seem pretty obvious, but you may be interested in this book if you are passionate about music and brains. I know a couple of people like that, and I'm sure that more exist. Personally, I just wanted an instructional book.