The Guitarist's Music Theory Book by Peter Vogl is the first music theory book designed for guitarists by a guitarist. The book explains music theory as it applies to the guitar & covers intervals, scales, chords, chord progressions, & the Nashville Number System. The included Audio CD features examples of all the music in the book & also an ear training section. The Music Theory Book was written to help all guitar players achieve a better understanding of the guitar & of the music they play.