This book contains concepts of music theory presented in such a way as to be easily understood by guitarists. All of the concepts are presented sequentially in an easy-to-follow formant using the guitar fingerboard as the visual tool. Contents include: scales; key signatures; intervals; chord construction and voicing; harmonizing melodies; chord embellishment and substitution; modes; cadences; augmented sixth chords; quartal harmony and more. Using this book, guitarists will be able to unravel the mysteries of music theory and realize that the concepts are not so mysterious after all.