VOICE LEADING AND PHRASE APPLICATION · 12 MIN SUGGESTED
Dominant ♭9 Chords on Guitar: Resolving the Flat Nine
Resolve a dominant lowered ninth to the tonic fifth, then compare the natural-ninth version with all other chord tones fixed.
Give the dominant flat ninth a destination · By Vincent Iannone · Updated
What is a dominant flat-nine chord?
A dominant flat-nine chord is a dominant seventh with a lowered ninth added: G7♭9 contains G, B, D, F and A♭. The ♭9 is measured from the dominant’s root, so in G7♭9 it is A♭, a semitone above the root an octave up. Its strong pull downwards is what makes the chord useful. Resolving G7♭9 to Cmaj7, A♭ can fall a semitone to G, the fifth of the new chord. Replacing only A♭ with A makes a plain G9, and the same descent becomes a whole step, which sounds softer. The flat nine is a common colour on dominant chords, especially in minor keys, but it is one choice among several alterations rather than a rule.
The idea
A lowered ninth is measured from the dominant root: G7♭9 contains A♭. Here A♭ moves down to G at Cmaj7. Replacing only A♭ with A makes G9 and turns that descent into a whole tone. This is one useful destination, not a rule governing every altered dominant.
Put it under your fingers
- Follow E♭–D over the worked D7♭9–Gmaj7 arrival.
- Play A♭–G in C, then change only the dominant ninth to A and compare the whole-tone descent.
- Move the original flat-ninth resolution to F and retrieve it in C.
A flat ninth resolves in G
Sound D7♭9, then Gmaj7. E♭4, the lowered ninth of D, falls a semitone to D4, the tonic fifth. The accompaniment omits each fifth; the melody supplies the tonic fifth at the arrival.
Sounding notes: E♭4 → D4.
| # | Sounding note | Move from the previous note |
|---|---|---|
| 1 | E♭4 | Starting note |
| 2 | D4 | Down 1 semitone |
Make it yours
Hold a dominant shell, add its lowered ninth as a separate note, then hear the target against the tonic. Compare the natural ninth without moving the other voices.
Keep the ideas connected.
- Guide-Tone Lines Through a Major ii–V–IConnect thirds and sevenths through a major ii–V–I, then change one tonic target deliberately.
- Minor ii–V–i on Jazz Guitar: m7♭5, 7♭9 and m6Hear iiø7–V7♭9 resolve into an explicitly named minor-sixth tonic and compare two nearby tonic targets.
- Tritone Substitution on Jazz Guitar: D♭7 for G7Explain D♭7 replacing G7 in C using its shared sounding tritone, correctly spelled degrees and chromatic bass.
- Jazz Guitar Phrasing Across Chord ChangesPlay one original line across named harmonic boundaries and retain its dominant-to-tonic resolution while changing one opening target.