This book will teach you the most important thing to understand music and especially guitar: Intervals.

An interval is the distance between two notes. It is essential, as a guitar player, to see intervals on the fret board. For example, chords are built from 1, 3, 5, and 7 of the scale. If you do not understand intervals , you can memorize this formula, but it will not get you anywhere if you can't see it on the fret board.

The goal of this book is to help you visualize the fret board better and understand why a chord, scale, and arpeggio is shaped the way it is. In other words, how good of a carpenter would you be if you didn't know how to tell the distance between two points? According to David Poole, “THIS BOOK IS SO IMPORTANT! I can't express it in words. This should be the foundation before learning any advanced guitar scales or arpeggios.”