The most comprehensive book on Modes, and modal music theory. Elucidates the new theory and method of Modal Diatonicism. It covers all of the natural "Church Modes" Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian, and diatonic sets including the prodominate major and prodominate minor sets and the respective relatives. It also provides description of the unique properties of Dorian. It covers the parallels, relative and prodominate parallels, parallel prodominate and parallel relatives for each mode. It has theory and method of secondary dominants and diminished, and parallel secondaries for each mode and has the corresponding diatonic variants. It describes and elucidates the properties of definitive modes such as Ionian and Phrygian and has over 100 notational examples and 7 short piano pieces demonstrating the secondary functions of: Ionian relative, Phrygian relative, Locrian Prodominate, and Lydian prodominate as well as pieces with modulations involving the parallels of Dorian relative, and Aoelian prodominate and the relative parallel of Mixolydian prodominate. The most expansive music theory text on modes, it is the third book in the series "Modern Harmonic and Melodic Music Theory and Method" and a companion to pt. 1 "Diatonic Variants and Enharmonic Scalar Functions"and pt. 4 "Chord Stacking and Modes, Sixths Chords and Modulations".