D#7♭9 — D# dominant seventh flat ninth chord
A dominant seventh chord with the ninth flattened. The flat ninth sits a semitone above the root in the octave above, and the chord resolves down a fifth.
- 1 = D#
- 3 = F##
- 5 = A#
- b7 = C#
- b9 = E
- Symbol
- D#7♭9
- Root
- D#
- Quality
- Dominant seventh flat ninth
- Family
- altered
- Notes
- D# F## A# C# E
- Degree formula
1 3 5 b7 b9- Semitones from the root
0 1 4 7 10- Distinct pitch classes
- 5
- Interval structure
- Stacked from the root: 4 semitones, 3 semitones, 3 semitones, 3 semitones
- Notation
- Written 7♭9. The dominant of a minor key, because the flat ninth belongs to the harmonic minor scale of the target.
- Key
- D# · Eb major / C minor key signature
Fingering charts
The library holds 3 fingerings of this chord and all of them are shown, in the library’s own order. Several fingerings of one chord is normal: the same notes can be stopped at different positions and on different strings.
Formula
The chord tones in order from the root, with the interval each one forms above it.
| Degree | Note | Semitones | Interval from the root |
|---|---|---|---|
| 1 | D# | 0 | Perfect unison |
| 3 | F## | 4 | Major third |
| 5 | A# | 7 | Perfect fifth |
| b7 | C# | 10 | Minor seventh |
| b9 | E | 1 | Minor second |
Inversions
An inversion is the same set of notes with a different one in the bass. The last column gives the distance of each note above the bass note, in semitones.
| Inversion | Bass note | Degree in the bass | Notes above the bass | Semitones above the bass |
|---|---|---|---|---|
| root position | D# | 1 | D# – F## – A# – C# – E | 0 4 7 10 1 |
| first inversion | F## | 3 | F## – A# – C# – E – D# | 0 3 6 9 8 |
| second inversion | A# | 5 | A# – C# – E – D# – F## | 0 3 6 5 9 |
| third inversion | C# | b7 | C# – E – D# – F## – A# | 0 3 2 6 9 |
| fourth inversion | E | b9 | E – D# – F## – A# – C# | 0 11 3 6 9 |
Playable voicings
These shapes were found by searching the fretboard of a standard-tuned guitar (E A D G B E) rather than copied from a chord book. The search allows every string to sound or to be muted, rejects any shape with a muted string between two sounding strings, rejects any shape whose fretted notes span more than four frets (a five-fret window), requires every chord tone to be present, and then sorts what remains with root-position shapes first and the most compact, lowest shapes next. The shapes shown are the first six of that ordering; other orderings are possible at the same frets.
| # | Shape (low string first) | Notes | Degrees | Bass | Span (frets) | Sounding strings |
|---|---|---|---|---|---|---|
| 1 | 11-10-11-9-11-9 | D# G C# E A# C# | 1 3 b7 b9 5 b7 | D# | 2 | 6 |
| 2 | 11-10-11-9-11-11 | D# G C# E A# D# | 1 3 b7 b9 5 1 | D# | 2 | 6 |
| 3 | 11-10-11-12-11-12 | D# G C# G A# E | 1 3 b7 3 5 b9 | D# | 2 | 6 |
| 4 | 11-13-11-12-11-12 | D# A# C# G A# E | 1 5 b7 3 5 b9 | D# | 2 | 6 |
| 5 | 11-10-8-9-8-9 | D# G A# E G C# | 1 3 5 b9 3 b7 | D# | 3 | 6 |
| 6 | 11-10-8-9-11-9 | D# G A# E A# C# | 1 3 5 b9 5 b7 | D# | 3 | 6 |
Shape numbers run from the lowest string to the highest, so the left-hand number is the sixth string (low E) in standard tuning. Multiple shapes are listed because a chord can be voiced several ways, and because a lower position is not always the better sounding one.
Related chords and scales
- KeyEverything in D#
- ScaleD# diminished (half-whole)
- ChordD#7
- ChordD#
Related