How to Build a Practical Jazz Reharmonization Plan

What are the fundamental harmonic principles that distinguish jazz reharmonization from standard chord progressions?

Jazz reharmonization replaces static functional chords with chromatic motion and extensions to create fluid, non-diatonic pathways. By utilizing 12 possible root movements rather than simple I-IV-V patterns, it transforms basic triads into complex structures that prioritize voice leading over traditional scale-based harmony.

How can secondary dominants and extended dominant chords be used to create smoother voice leading?

Secondary dominants and extended chords facilitate smooth voice leading by creating chromatic pull between chords that would otherwise lack a strong functional connection.

• V7/V chords act as temporary anchors that pull the ear toward the dominant, turning a standard progression into a series of cascading resolutions.
• 13th chords provide a bridge between the melody and the bass, allowing the upper extensions to resolve downward by half-steps.
• Alt chords introduce altered tensions like the flat 9 or sharp 11, which resolve naturally into the chord tones of the subsequent target.
• 9th chords offer a lush, stable sound that maintains the harmonic integrity of the original progression while adding sophistication.

What is the role of tritone substitution in altering the functional movement of a jazz composition?

Tritone substitution functions by swapping a dominant chord for another whose root is three whole steps away, sharing the same essential guide tones. In a II-V-I progression in C major, substituting the Dm7-G7-Cmaj7 with Dm7-Db7-Cmaj7 creates a smooth chromatic bass line descending by half-steps. This technique relies on the fact that the third and seventh of a G7—B and F—are the same notes as the seventh and third of a Db7.

The nuance here is that the substitution works best when the melody note is not the root of the original dominant chord. If the melody sits on the root of the G7, using a Db7 will create a jarring dissonance that obscures the melody. Always verify that the chord tones of the substitute chord support the melodic contour rather than clashing with it.

In what ways do slash chords and pedal points provide alternative harmonic colorings to a melody?

Slash chords and pedal points allow for static bass movement beneath shifting upper structures, creating a sense of harmonic suspension that keeps the listener engaged.

1. Slash chords like C/Bb allow a tonic triad to function as a dominant, providing a richer, more modern sound than a standard Bb7.
2. Pedal points involve holding a single bass note, such as the tonic or dominant, for 4 to 8 bars while the chords above change.
3. Upper structures in slash chords should avoid doubling the bass note to prevent muddying the frequency range.
4. Tension builds during a pedal point because the ear expects the bass to resolve, making the eventual movement feel more satisfying.

How does one identify the target structural points in a melody that require specific harmonic support?

Structural points are typically found at the end of 4-bar phrases or where the melody lands on a long, sustained note. Identifying these 2 or 3 anchors per section allows you to build a harmonic framework that supports the melody while leaving room for creative movement in between.

What techniques are used to implement chromatic approach chords and passing chords within an existing progression?

Chromatic approach chords utilize diminished 7th chords or secondary dominants to lead into a target chord by moving a half-step above or below. These chords should be placed on weak beats to avoid disrupting the primary harmonic rhythm of the piece. A lot of people assume that every passing chord needs to be a full, complex voicing, but in practice, simple triads or shell voicings often sound cleaner and more effective within a fast-moving jazz arrangement.

How can modal interchange be effectively applied to introduce unexpected tonal colors while maintaining melodic coherence?

Modal interchange involves borrowing chords from parallel keys, such as using the minor iv chord in a major key, to inject fresh harmonic colors. For instance, in C major, utilizing an Fm7 chord—borrowed from C minor—creates a melancholic, sophisticated pull toward the C major tonic. This technique allows for a broader palette of sounds while keeping the listener grounded in the original key center.

The primary nuance is that modal interchange must be handled with restraint to prevent the tonal center from drifting entirely. If you borrow too many chords from the parallel minor, the piece may lose its major-key identity. Use these borrowed chords sparingly, perhaps once per phrase, to highlight specific melodic moments rather than replacing the entire harmonic structure of the composition.

What are the common pitfalls to avoid when reharmonizing a piece to ensure the original melodic intent remains intact?

Avoiding pitfalls requires balancing harmonic innovation with the preservation of the original melodic contour and the composer’s intended emotional arc.

• 1 chord per measure is usually the limit to avoid cluttering the arrangement and losing the rhythmic drive of the original song.
• 2 notes from the melody should always be checked against the chord tones to make sure that no clashing intervals destroy the clarity of the line.
• 3 primary cadences must remain recognizable to the listener, as these structural pillars define the song's identity and prevent the harmony from sounding aimless.
• 4 beats of silence or space can be more effective than adding extra chords, as it allows the melody to breathe and stand out.