Instruct: Classify a review as either positive or negative.
Query: Learn your scales! Inside and out!

I've been playing guitar for over 15 years and I've not found a better book for learning your scales and modes. The way it's laid out in this book is very sweet. You can find any key and any scale you want with ease. The first few pages how ever are the most valuable part of this book. A very straight forward "Block" approach to understanding the interval relationship of how any scale is put together. A must have for anyone serious about playing lead guitar!