The Essential Guide to Chords Progression & Theory-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 and structural 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 progressions that range from a basic three chord blues to the most advanced multi-chord jazz arrangements. For all levels beginners to professionals with large easy-to-read chorddiagrams; most popular major and minor keys; and more.