Questions: Advanced Jazz Reharmonization and Chord Substitution

Question 1

A jazz pianist reharmonizes a standard by layering tritone substitutions, chromatic approach chords, and upper-structure triads throughout every phrase. The result is harmonically dense but the melody seems to float free without direction. What principle of reharmonization has been violated?

• A. Tritone substitutions cannot be combined with upper-structure triads in the same passage
• B. Reharmonization must always preserve the original bass line
• C. The substitutions are serving the harmonic complexity rather than the melody — they obscure rather than recast the tune's character
• D. Advanced reharmonization requires more chord changes, not fewer

Answer: (C)

The core principle of reharmonization is that it must serve the melody and the musical moment. Stacking techniques without regard to whether they support or obscure the tune's character is the most common advanced student error. Reharmonization is a compositional act — each choice shapes how the melody is heard and how a soloist navigates the changes. Harmonic density for its own sake is not the goal; recasting the melody's emotional weight is.

Question 2

Coltrane changes (as used in 'Giant Steps') divide the octave into three equal parts using major-third cycles. What is the structural consequence of this division?

• A. Each key area resolves through a tritone substitution, producing a chromatic bass line
• B. The octave is divided into three equal parts, each functioning as a local tonic with its own ii-V-I resolution
• C. The minor thirds create a diminished seventh chord that connects all three tonal centers
• D. The cycle moves in whole steps, creating a symmetric scale for improvisation

Answer: (B)

Coltrane changes divide the octave into three equal major-third intervals (e.g., B major → G major → Eb major), with each tonal center approached by its own ii-V progression. Because major thirds divide the octave into exactly three equal parts, returning to the starting pitch closes the cycle. This creates rapid tonal movement while maintaining strong V-I resolutions — a dramatic intensification of harmonic rhythm that challenges both the improviser and the listener to follow three tonic areas in quick succession.

Question 3

A reharmonization that increases harmonic complexity typically produces a more sophisticated musical result.

• T. True
• F. False

Answer: False

More complexity does not automatically improve a reharmonization. The best reharmonizations serve the melody and the specific musical moment — sometimes a simpler harmonic context makes the melody sing more clearly. Adding chord substitutions without considering whether they support or obscure the tune's character is precisely the mistake described in the common misconceptions for this topic. Sophistication in reharmonization means knowing when not to substitute as much as knowing when to.

Question 4

The same melody can yield fundamentally different emotional characters depending on which reharmonization is applied beneath it.

• T. True
• F. False

Answer: True

This is the defining insight of reharmonization as a compositional act. The harmonic context determines how the listener hears each note in the melody — the same pitch can function as a stable chord tone, a tension, a dissonance, or a resolution depending on the underlying harmony. Upper-structure triads over altered dominants, Coltrane changes, and diminished substitutions each paint the melody in entirely different emotional colors. This is why reharmonization goes beyond mere chord replacement: it reframes how the soloist and listener experience every note.

Question 5

Why is reharmonization described as a 'compositional act' rather than just a harmonic technique? What distinguishes it from simply swapping one chord for another?

Model answer: Reharmonization reshapes the harmonic landscape in which the melody exists — it changes not just the chords but the musical context that gives each melodic note its character, tension, and resolution. A compositional act implies intentionality about form, emotional arc, and the listener's experience. Simply swapping a ii-V-I for a tritone substitution is a technique; choosing which substitution serves this melody in this moment to create this emotional effect is a compositional decision. The harmonic choices also shape how a soloist hears and navigates the changes in real time, making reharmonization an act of co-authorship with both the original composer and the improviser.

The distinction between technique and composition lies in intentionality and context-sensitivity. Techniques can be applied mechanically; composition requires judgment about what each choice does to the listener's experience of the piece. Advanced reharmonization requires both the technique (knowing what substitutions are available) and the compositional judgment (knowing which ones serve the musical moment).