6/16/2023 0 Comments Key sonority19 is referred to as a cadential 6 / 4 chord. Both notes resolve down by step to form a root position V chord at the end of the measure, setting up the perfect authentic cadence in m. Both are nonharmonic tones: the C is a 4–3 suspension from the IV chord and the G is an accented passing tone. 19 is not a functional tonic chord, but rather an embellishment and intensification of the dominant. Therefore, the sonority on the downbeat of m. 19 is the root of the dominant at the end of the phrase. To do so, however, would contradict the manner in which this chord functions. Subdominant chords can and sometimes do move directly to tonic chords, so you may be tempted to label this sonority I 6 / 4. 19 contains the pitches C and E above a G in the bass. Let us begin by considering the expansion of a single triad:įollowing a IV chord in m. Examples from actual compositions will be provided throughout. In each case, the chord undergoing expansion will be called a reference sonority. From there we will expand a harmony as it changes from root position to first inversion through a passing auxiliary sonority. We will begin by expanding a chord in root position with a neighboring auxiliary sonority. In this chapter you will apply your knowledge of basic interval progressions to expand a single harmony. These techniques can be broadened, through combination with basic interval progressions, to embrace entire harmonies. We have already learned about melodic embellishment as a means of decorating individual tones (see Chapter 15). By prolonging harmonies over time, composers are able to build or sustain musical tension and expand musical works to large dimensions. Techniques of harmonic expansion play a crucial role in tonal Western art music. Diatonic Polyphony and Functional Harmony
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