Jazz Reharmonization Basics for Better Chord Progressions

What is the role of secondary dominants in creating harmonic tension?

Secondary dominants act as temporary V chords that pull the listener toward a specific diatonic target, creating a sense of forward motion. By introducing a chord whose root is a perfect fifth above the goal, you establish a strong resolution. Many people assume these must resolve to a tonic chord, but they actually function perfectly when resolving to any diatonic degree. This keeps the progression fluid while adding a sophisticated, temporary pull that keeps the listener engaged without needing to abandon the original key center entirely.

How do tritone substitutions function to replace standard dominant chords?

Tritone substitution relies on the shared tritone interval between two dominant seventh chords whose roots are a flat fifth apart. Because the third and seventh of a G7 chord (B and F) are the same notes as the seventh and third of a Db7 chord (Cb/B and F), the two chords share the same functional tension. Replacing G7 with Db7 creates a smoother, chromatic bass line that descends by half-step toward a C major or minor resolution.

For example, in a ii-V-I progression in C, changing Dm7-G7-Cmaj7 to Dm7-Db7-Cmaj7 provides a more modern, sophisticated sound. However, the nuance lies in the melody. If the melody note is the natural 11th of the original dominant, the substitution might create an unwanted clash. You'll often find that the melody note must be adjusted or the substitution avoided if it conflicts with the chord's new altered extensions.

What are the primary differences between functional and non-functional reharmonization techniques?

Functional reharmonization relies on traditional cadential logic, while non-functional approaches prioritize color and symmetry over strict resolution.

• Diatonic chords provide the structural bedrock for functional movements, ensuring the ear hears a clear home key.
• Chromatic planing allows for non-functional sequences where chords move in parallel, favoring texture over resolution.
• Symmetry drives non-functional designs, such as using diminished scales to move between chords regardless of traditional key relationships.
• Voice leading remains the primary concern in functional settings, whereas non-functional styles often favor the specific vertical sonority of a chord.

In what ways can chord extensions and alterations be used to modify a basic progression?

Extensions and alterations transform basic triads into complex, colorful structures that define the modern jazz vocabulary.

1. Ninth chords add a lush, open quality by stacking an extra third above the seventh.
2. Altered dominants utilize b9, #9, #11, or b13 intervals to heighten the tension before a resolution.
3. Sus chords replace the third with a fourth to create an ambiguous, floating harmonic state.
4. Thirteenth chords provide a full, rich sound by including the sixth scale degree as an extension.
5. Sharp-eleven chords introduce a Lydian sound, which feels brighter and more stable than standard dominant structures.

How does the concept of 'side-slipping' or chromatic approach chords influence modern jazz improvisation?

Side-slipping introduces a momentary departure from the established key by shifting a melodic or harmonic idea up or down by a half-step.

• Half-step shifts create an immediate, jarring tension that demands a return to the original key to resolve the listener's ear.
• Outside playing describes the improvisational practice of intentionally playing these displaced notes to build energy during a solo.
• Rhythmic placement determines the success of the technique, as side-slipping is most effective when it lasts for only two to four beats.
• Resolution points must be clearly defined, as staying "outside" for too long creates fatigue rather than excitement.

What is the purpose of applying 'Coltrane changes' to a standard jazz composition?

Coltrane changes replace standard ii-V progressions with a cycle of major chords moving by major thirds. This technique, famously used in "Giant Steps," accelerates the harmonic rhythm by introducing three tonal centers within a single cycle, creating a dense, rapid-fire movement that challenges the soloist.

How do pedal points and slash chords serve to stabilize or expand a harmonic sequence?

Pedal points provide a static bass note that anchors a progression while the chords above it shift, creating a sense of suspension and anticipation. This technique is common in modal jazz, where the bass maintains the root of the scale, allowing for complex upper structures to move freely without losing the tonal center. For instance, playing a series of triads over a static C pedal creates a rich, layered texture that feels both grounded and expansive.

Slash chords, conversely, define specific inversions or polychordal structures by placing a non-root note in the bass. While a pedal point stabilizes, a slash chord often directs the harmonic energy toward a specific inversion, such as using a G/B to lead into a C chord. One nuance to remember is that excessive use of slash chords can clutter the arrangement, making it difficult for the rhythm section to maintain a clear sense of the fundamental progression.

What criteria should a musician use to determine if a reharmonization remains faithful to the original melody?

Yes. A reharmonization is faithful if the melody notes function as chord tones or acceptable tensions within the new structure. You should make sure that at least 75% of the original melody notes land on consonant intervals within the new chords to maintain the listener's connection to the source material.