A sequential continuation of Certificate Theory III. This semester will conclude with an introduction to 20th century harmony and the acquisition of the practical and theoretical skills needed to comprehend and perform that music. It will start from the topics of enharmonic modulation through augmented sixth and diminished seventh chords and its role in the further expansion of tonality in the music of late romanticism. The study will be reinforced with dictation using rhythms with changing time signatures and complex subdivisions, and sightreading using soprano, alto, and tenor clefs. Prerequisite is Advanced Theory III.