Chords work together. 25 chord progressions in all keys, to improvise with the major scale. To compose, improvise, create chord progressions. Major scale and chords in twelve keys. Charts, diagrams with name of notes, intervals and fingerings. Backing tracks. 14 chords diagrams by key. Major Scale diagrams (one pattern): A Shape - Pattern 4, with fingering, notes and intervals in all keys. Audio tracks on the web site (link to access).