Chapter 10 Harmonic progression Harmonic Progression • Defined as the movement from one chord to the next; a succession of chords or chord progression • A principal organizing force Root Relationships • The relationship of chords to the prevailing tonality • The intervals formed by the roots of adjacent chords Chord Progressions • • • • • Circle progression Non-circle progression Ascending fifths Ascending seconds Descending thirds Circle Progression • The most common and strongest • Adjacent chord roots in ascending fourth or descending fifth (same note when inverted) • The basis of all harmonic progression • Found in succession: ii-V-I, or even vi-ii-V-I Circle Progression • Can derive many harmonic patterns from this progression: I-IV-vii°-iii-vi-ii-V-I, and many can be used based on this progression. Note that the progression starts and ends on the tonic (see figure 10.2) in book. • Circle progression is a drive toward the tonic Non-Circle Progression • Anything that isn’t circle • Used in conjunction with circle progression • Adds variety to the music Ascending Fifths • I-V, IV-I, V-ii, vi-iii, iii-viiº, and ii-vi • Can be descending fourth also • Provides relief from the constant motion of circle progression • Most common is I-V • Half cadence is a good example of this progression Ascending Seconds • Adjacent chords whose roots are a second apart: IV-V, V-vi, I-ii, ii-iii, iii-IV, and viiº-I • Used to prepare a shift from the circle progression to another • The vii° chord is often used in a dominant function as a vii°6 to a I Descending Thirds • I-vi, vi-IV, IV-ii, iii-I, and V-iii • Chords whose roots are a third apart • Provide contrast and facilitate change from circle progression to another • Used in harmonic movement away from the tonic or in a longer chord series Tonic 6/4 Triad • Used in a cadential manner as in I6/4-V-I • A decoration of the V chord that follows it Repeated Chords • No progression takes place with repeated chords, whether inverted or not Harmonic Rhythm • The frequency of harmonic changes in a composition • Typically defines the meter • Can be slow or fast in its changes Harmonizing a Chorale Phrase 1. 2. 3. 4. 5. 6. You must use half or authentic cadences for the final two notes of each phrase You should use circle progressions throughout each phrase Harmonize each melody note with one chord. It is possible to repeat chords, but add inversions for variety Use first inversion chords to make a smoother bass line Shape the bass line carefully to make it a singable melodic line. Avoid overuse of ascending third and descending second progressions