Three books in one! First, a music theory manual that describes the different types of twelve-bar blues forms (slow change, quick change, five chord blues, jazz blues, etc.) and presents them as both chord progressions andstructural formulas. Second, an introduction and thorough study of “rhythm” chords – the essential three-note voicings that every guitarist must know for accompanying small blues groups to jazzy big bands. Third,a comprehensive series of twelve-bar chord progr...