Reharmonization Strategies
Same melody, completely different mood — reharmonization is the art of changing everything underneath a tune while the tune itself never moves.
What is reharmonization?
Reharmonization means writing new chords underneath a melody that already exists, without changing the melody's notes or rhythm at all. Every technique from this chapter — secondary dominants, borrowed chords, tritone substitutions, chromatic mediants — is a tool a reharmonizer can reach for. The one rule that ties them all together: whatever chord you put underneath, the original melody note has to still make sense against it, either as a chord tone (root, 3rd, 5th, 7th) or a musically sensible tension (like a 9th or 13th).
Five go-to strategies
- Insert a ii–V leading into a target chord, turning one static chord into forward motion.
- Tritone substitution to swap a dominant for its tritone partner and create chromatic bass movement.
- Chromatic passing/approach chords that connect two chords with a half-step chord in between.
- Borrow from the parallel major or minor for an unexpected color shift under the same melody note.
- Upper-structure reharmonization, replacing a simple chord with a richer extended or altered one that still contains the melody note somewhere in its structure.
Checking the melody still fits
Take a melody sitting on the note E over a plain C major chord — E is the 3rd, the most obvious possible fit. Reharmonize with A minor 7 (vi7) instead, and E becomes the 5th — still perfectly consonant. Try a borrowed F minor (iv), and E becomes a chromatic passing color a half-step above the 5th — more tension, but still usable as a passing tone. The melody never changes; only its harmonic context does.
Common questions
What is reharmonization?
Putting new chords underneath an existing melody, changing the harmonic color while the tune stays the same, as long as each melody note still works against the new chord.
What are common reharmonization techniques?
Inserting a ii-V, using tritone substitutions, adding chromatic passing/approach chords, borrowing from the parallel major/minor, and upper-structure reharmonization.
How do you know if a reharmonization works?
Check that the original melody note is still a usable chord tone or a sensible tension against the new chord.
Does reharmonization change the melody?
No — the melody notes and rhythm stay the same; only the chords underneath change.
Reharmonize your own progressions
Melody Monkey's Songwriting Studio lets you swap chords under a melody and hear the new color instantly.
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