(Music Instruction). This two-book series includes a wealth of material used to teach harmony and theory in college-level courses by George Heussenstamm, author of the Norton Manual of Musical Notation . Part 2 Chromatic introduces readers to modulation and more advanced harmonies, covering: secondary dominants; borrowed chords; the Neapolitan 6th chord; augmented 6th chords; 9th, 11th and 13th chords; and more. In addition to text, the book features many musical examples that illustrate the concepts, and exercises that allow readers to test and apply their knowledge.