If you are a guitarist, beginner or advanced, this book will take your playing to another level. In addition to being easy to read (with a little humor thrown in), it may reinvent the way you think about the fretboard. If you are a guitar teacher, it will be an invaluable tool for your students. I've been playing for 16 years, and this book helped get me off the plateau I've been on for a long time. I plan on buying more of this guy's books.