A comprehensive treatise on harmony in two volumes. It is designed for the beginner to very advanced student of music. The treatise is a comprehensive text with elegant and beautiful exercises in four-part harmony. Volume 1 begins with the basic elements of music, scales, key signatures, intervals, triads and seventh chords and four part writing. Modulation, sequences and harmonizing and melody are found here. Volume 2 continues the study with Dominant 7th chords, Dominant 9th chords, Non-Dominant chords, Altered Chords, Neapolitan, Augmented Sixth Chords and the beginnings of formal analysis.