Level 2 · Course 14
Modal harmonization
Colouring each mode with its characteristic chords — no mandatory tonal resolution.
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Pause Culture · Modal harmony
Claude Debussy (1862–1918)
Debussy broke with tonal harmony by using medieval modes, pentatonic scales and parallel chords. In La Cathédrale engloutie (1910), blocks of chords move together without functiona…
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À retenir : Chords are not functions (T, SD, D) — they are colours. In modal music, we paint with chords rather than chaining them in a directed progression.
Modal vs tonal harmonisation
In tonal harmony, chords have functions: Tonic (T), Subdominant (SD), Dominant (D). The progression SD→D→T creates tension and resolution. In modal harmony, chords have colours: they oscillate around the tonic and sustain the colour of the mode — with no mandatory resolution.
| Tonal | Modal | |
|---|---|---|
| Goal | Create tension → resolution | Sustain a modal colour |
| Typical progression | II–V7–I (or IV–V7–I) | Im–IV (dorian) / Im–♭II–Im (phrygian) |
| Chord role | Functional (T / SD / D) | Colouristic (characteristic of the mode) |
| V7→I | Essential — mandatory resolution | Avoided — breaks the modal colour |
| Listening impression | 'Arrives somewhere' | 'Stays somewhere' |
| Key chord | Dominant V7 (tension) | Characteristic chord of the mode |
Golden rule: to maintain the modal colour, regularly use the characteristic chord of the mode (the one containing the distinctive note) and avoid V7→I (which introduces the leading tone absent from the mode and creates a tonal resolution).
Hear the difference
Tonal — C major
C – F – G7 – C
I – IV – V7 – I: tension on G7, resolution to C.
Modal — D dorian
Dm – G – Dm – G
Im – IV – Im – IV: coloured oscillation, no resolution.
Characteristic chord by mode
| Mode | Distinctive note | Characteristic chord | Typical progression |
|---|---|---|---|
| Dorien | Major 6th (♮6) | IV major | Im – IV – Im |
| Phrygien | Flattened 2nd (♭2) | ♭II major | Im – ♭II – Im |
| Lydien | Augmented 4th (#4) | II major | I – II – I |
| Mixolydien | Minor 7th (♭7) | ♭VII major | I – ♭VII – IV – I |
| Éolien | No leading tone (♭6, ♭7) | ♭VII major | Im – ♭VI – ♭VII – Im |
Common pitfall: harmonising a modal melody with V7→I "by reflex". E.g. in D dorian, playing A7→Dm introduces C# (the leading tone absent from dorian) and immediately transforms the modal colour into classical harmonic minor.