All fourths tuning refers to tuning one's guitar such that the intervals between the stings ascend in fourths. Why should you tune to fourths? Chord, arpeggio and scale shapes are uniform It's ergonomic One has control over jazzy voicings One has control over intervals It's easy to make quartal chordsThis book includes: Over 100 fingering diagrams 14 sheets of song transcriptions Copious explanations of jazz theory Tips on composition and performance