# D♯ Augmented 7th piano chord (D♯aug7)

D♯aug7 contains D♯, F×, A× and C♯. An augmented triad with the minor seventh added on top. D♯ and C♯ are black keys; F× and A× are white.

- Canonical page: https://piano.org/chords/augmented-7th/d-sharp/
- Entity: chord:augmented-7th:d-sharp
- Notes: D♯ F× A× C♯
- Formula: 1 3 ♯5 ♭7
- Intervals from root: P1, M3, m6, m7
- Interval stack (semitones): 4 4 2
- Also written: D♯aug7, D#aug7, D♯ augmented 7th
- Parameters: A440, 12-TET, 165 mm octave, spans centre to centre

## Construction

| Degree | Note | Interval from root | Semitones |
| --- | --- | --- | --- |
| 1 | D♯ | Perfect unison | 0 |
| 3 | F× | Major third | 4 |
| ♯5 | A× | Minor sixth | 8 |
| ♭7 | C♯ | Minor seventh | 10 |

## Fingering

Rest your right hand over the notes with finger 2 on D♯, finger 3 on F×, finger 4 on A×, finger 5 on C♯. The left hand mirrors it.
Right hand 2-3-4-5, left hand 5-4-3-2. Source: piano.org fingering method v1.

## Inversions

| Position | Bass | Notes in order | Figured bass | Span |
| --- | --- | --- | --- | --- |
| Root position | D♯ | D♯3 F×3 A×3 C♯4 | 7 | 10 st, 138 mm |
| First inversion (D♯aug7/F×) | F× | F×3 A×3 C♯4 D♯4 | 6/5 | 8 st, 110 mm |
| Second inversion (D♯aug7/A×) | A× | A×3 C♯4 D♯4 F×4 | 4/3 | 8 st, 110 mm |
| Third inversion (D♯aug7/C♯) | C♯ | C♯4 D♯4 F×4 A×4 | 4/2 | 10 st, 138 mm |

## Voicings (10)

| Voicing | Notes | Span | Relation | Omits or adds |
| --- | --- | --- | --- | --- |
| Close, root position | D♯3 F×3 A×3 C♯4 | 10 st, 138 mm | identical | none |
| Close, first inversion | F×3 A×3 C♯4 D♯4 | 8 st, 110 mm | identical | none |
| Close, second inversion | A×3 C♯4 D♯4 F×4 | 8 st, 110 mm | identical | none |
| Close, third inversion | C♯4 D♯4 F×4 A×4 | 10 st, 138 mm | identical | none |
| Drop 2 | A×2 D♯3 F×3 C♯4 | 14 st, 193 mm | identical | none |
| Drop 3 | F×2 D♯3 A×3 C♯4 | 18 st, 248 mm | identical | none |
| Drop 2 and 4 | D♯2 A×2 F×3 C♯4 | 22 st, 303 mm | identical | none |
| Shell, root ♭7 3 | D♯2 C♯3 F×3 | 16 st, 220 mm | subset | omits A× |
| Guide tones, 3 and ♭7 | F×3 C♯4 | 6 st, 83 mm | subset | omits D♯ and A× |
| Rootless close | F×3 A×3 C♯4 | 6 st, 83 mm | subset | omits D♯ |

## One-edit neighbors

| Becomes | Edit | Changes | Common tones |
| --- | --- | --- | --- |
| D♯aug | 1 3 ♯5 | drops C♯ | 3 |
| D♯7 | 1 3 5 ♭7 | A× becomes A♯ | 3 |
| D♯9 | 1 3 5 ♭7 9 | A× becomes A♯, E♯ | 3 |
| D♯ | 1 3 5 | A×, C♯ becomes A♯ | 2 |
| D♯maj7 | 1 3 5 7 | A×, C♯ becomes A♯, C× | 2 |
| D♯m7 | 1 ♭3 5 ♭7 | F×, A× becomes F♯, A♯ | 2 |
| D♯m7♭5 | 1 ♭3 ♭5 ♭7 | F×, A× becomes F♯, A | 2 |
| D♯7sus4 | 1 4 5 ♭7 | F×, A× becomes G♯, A♯ | 2 |
| D♯6 | 1 3 5 6 | A×, C♯ becomes A♯, B♯ | 2 |
| D♯add9 | 1 3 5 9 | A×, C♯ becomes A♯, E♯ | 2 |

## Set theory

- Absolute pitch classes: {3, 7, 11, 1}
- Relative pitch classes: [0, 4, 8, 10]
- Normal order: [11, 1, 3, 7]
- Prime form: (0248)
- Forte number: 4-24
- Interval vector: <020301>

## Frequencies (close root position)

| Note | MIDI | Frequency |
| --- | --- | --- |
| D♯3 | 51 | 155.56 Hz |
| F×3 | 55 | 196.00 Hz |
| A×3 | 59 | 246.94 Hz |
| C♯4 | 61 | 277.18 Hz |

## Questions and answers

### What notes are in D♯aug7?

D♯aug7 contains D♯, F×, A× and C♯. The formula is 1, 3, ♯5, ♭7.

### How do you play D♯aug7 on piano?

Play D♯, F×, A× and C♯ together. Right hand fingers 2, 3, 4, 5; left hand 5, 4, 3, 2. D♯ and C♯ are black keys; F× and A× are white.

### What are the inversions of D♯aug7?

4 positions: root position D♯ F× A× C♯, D♯aug7/F×, D♯aug7/A×, D♯aug7/C♯.

### What is the difference between D♯aug7 and D♯aug?

Drops C♯. 3 of the notes are shared.

### What is an easy D♯aug7 for small hands?

The guide tones, 3 and ♭7 voicing, F×3 C♯4, spans 6 semitones or about 83 mm.

### What are the frequencies of D♯aug7?

From D♯3 at A440 in 12-TET: 155.56, 196.00, 246.94, 277.18 Hz.

### What is the set class of D♯aug7?

Prime form (0248), Forte 4-24, interval vector &lt;020301&gt;.

### How do I transpose D♯aug7 to another key?

Keep the 1, 3, ♯5, ♭7 formula on the new root. Caug7 is C, E, G♯, B♭; D♭aug7 is D♭, F, A, C♭.

### Is E♭aug7 the same as D♯aug7?

Enharmonically yes: the same piano keys and the same sound, spelled differently.

## Provenance

Every derived value above is computed by the piano.org theory kernel from the root, the quality and the stated parameters. Nothing is hand-entered per chord.

Machine record: https://piano.org/api/knowledge/v1/entities/chord:augmented-7th:d-sharp
Last reviewed: 2026-08-12