Chapter 30 on the Neopolitan Chord
Chapter 31, Introduction to the Augmented Sixth Chord
Altered, commontone and V9 chords, Chapter 32
Chapter on Extended Harmonies from Robert Gauldin, Harmonic Practice in Tonal Music
Chapter 33, Chromatic Sequence
Chapter 34, Chromatic Modulation
Steven Laitz, The Complete Musician, The diminished seventh chord in modulation
Steven Laitz, The Complete Musician, Chromatic Modulation and the German Lied
16C review: Modulation to related keys, Mode Mixture and the Neapolitan, Harmonic Sequence
Introduction to the Augmented Sixth chord
More fun with Augmented Sixth chords
Chromatic embellishing chords and Altered fifths
Common-tone chords: sevenths and Gr6/5
Phrase structure, binary and ternary form
Composition 101: Guide to Phrase Expansion