ABSTRACT
Chordal extensions consist of different forms of the ninth, the eleventh, and the thirteenth. The categories for five-part chords suggest the possible harmonic function of chords in chord progressions. The functional behavior of five-part chords depends on the specific context in which they occur. A chord from the major category might function as a tonic or a predominant depending on its role and position in the chord progression, etc. Five-part dominant 7th chords feature an impressive variety of harmonic formations. The predominant status stems from the fact that they often precede a regular dominant 7th chord. A diminished ninth chord, Ddim9, has strong melodic and voice-leading tendencies. A diminished major ninth major seventh chord, Ddim9, has a pliable structure with interesting functional associations. Both realizations sound idiomatic, which confirms the earlier premise that with the use of five-part chords one can make any jazz progression sound complete and satisfying.
