(Berklee Guide). Improvisation is the art of real-time composition. This book will guide you through exploring some of the many possible scale choices that can be used with chords and chord progressions, giving you a greater range of expression. Topics include the basics of chord-scale theory, modes and how to use them, the blues scale, symmetrical scales, and more. The accompanying CD features demonstration and play-along tracks to really drive each lesson home. | Chord-scale Improvisation For Keyboard by Ross Ramsay, Book & Toy | Indigo Chapters