If you’re looking to add tension, color, and voice-leading options to your dominant 7th chords, the D7#5b9 chord should be in your toolkit.
In this post, I’ll show you a rootless voicing that moves beautifully through a minor ii–V–I, plus a matching altered scale cell you can use to improvise. As always, I’ll break down how it works, when to use it, and how to practice it.
What Is a D7#5b9 Chord?
The D7♯5♭9 is a dominant seventh chord with two alterations:
- ♯5 (sharp five)
- ♭9 (flat nine)
Together, these tones create a lot of harmonic tension—perfect for resolving to a minor chord in a ii–V–I progression. You’ll often see this chord written as:
- D7#5b9
- D7alt
- D7♭9 (you can often test the ♯5 here too)
The key to using this shape effectively is learning a rootless voicing that’s easy to move around.
Rootless D7#5b9 Voicing (Guitar-Friendly Shape)
Here’s the voicing I recommend:
From low to high:
- ♯5 (1st string, 6th fret – ring)
- 3rd (4th string, 4th fret – index)
- ♭7 (3rd string, 5th fret – middle)
- ♭9 (2nd string, 4th fret – barred with index)
🎯 Root is implied on the 2nd string, 3rd fret — that’s your D.
Once you know where your notes are on the 2nd string, you can move this voicing to any key just by shifting positions.
Where to Use the D7#5b9 Chord
This voicing works great in minor ii–V–I progressions like:
Am7♭5 → D7#5b9 → Gm7
Here’s why:
- The voice leading is smooth
- The top note ascends, then resolves down
- The bass voice moves chromatically
- You get maximum tension without clashing with the melody (as long as you’re not stepping on the original line)
You can also use it anywhere a dominant 7th chord functions as a V. That includes turnarounds, secondary dominants, and tritone subs.
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Matching Improv Cell for D7#5b9
If you want to solo with this sound, try this altered scale cell built for the same voicing position:
From low to high:
♯5 – ♭7 – Root – ♭9 – ♯9 – 3 – ♭5 – ♯5
This one cell gives you:
Every major altered tension (♯5, ♭5, ♯9, ♭9)
The core chord tones (1, 3, ♭7)
Use it over any V7 chord in a minor ii–V–I to add tension and resolution.
Picking Tips for Clean Technique
This cell is a great technical drill too.
- Down pick + hammer-on for economy
- Sweep picking through string sets
- Slides and pull-offs for smooth transitions
- Directional picking where possible to reduce movement
It sounds complex—but it’s surprisingly playable with just a few focused reps.
Full D7#5b9 ii–V–I Line
Here’s a line you can use right away:
Start with a short lick outlining Am7♭5, referencing a Locrian cell. Then ascend through the D7#5b9 altered cell, hitting tensions like ♯9, ♭9, and ♭5, and resolve cleanly into Gm7’s 3rd and 5th.
This gives you:
- Strong harmonic connection
- Rich altered color over the 5 chord
- A satisfying resolution on the 1
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