# G♯ Augmented piano chord (G♯aug)

G♯aug contains G♯, B♯ and D×. Two stacked major thirds. G♯ is a black key; B♯ and D× are white.

- Canonical page: https://piano.org/chords/augmented/g-sharp/
- Entity: chord:augmented:g-sharp
- Notes: G♯ B♯ D×
- Formula: 1 3 ♯5
- Intervals from root: P1, M3, m6
- Interval stack (semitones): 4 4
- Also written: G♯aug, G#aug, G♯ augmented
- Parameters: A440, 12-TET, 165 mm octave, spans centre to centre

## Construction

| Degree | Note | Interval from root | Semitones |
| --- | --- | --- | --- |
| 1 | G♯ | Perfect unison | 0 |
| 3 | B♯ | Major third | 4 |
| ♯5 | D× | Minor sixth | 8 |

## Fingering

Rest your right hand over the notes with finger 1 on G♯, finger 3 on B♯, finger 5 on D×. The left hand mirrors it.
Right hand 1-3-5, left hand 5-3-1. Source: piano.org fingering method v1.

## Inversions

| Position | Bass | Notes in order | Figured bass | Span |
| --- | --- | --- | --- | --- |
| Root position | G♯ | G♯3 B♯4 D×4 | 5/3 | 8 st, 110 mm |
| First inversion (G♯aug/B♯) | B♯ | B♯4 D×4 G♯4 | 6/3 | 8 st, 110 mm |
| Second inversion (G♯aug/D×) | D× | D×4 G♯4 B♯5 | 6/4 | 8 st, 110 mm |

## Voicings (5)

| Voicing | Notes | Span | Relation | Omits or adds |
| --- | --- | --- | --- | --- |
| Close, root position | G♯3 B♯4 D×4 | 8 st, 110 mm | identical | none |
| Close, first inversion | B♯4 D×4 G♯4 | 8 st, 110 mm | identical | none |
| Close, second inversion | D×4 G♯4 B♯5 | 8 st, 110 mm | identical | none |
| Open, fifth on top | G♯2 D×3 B♯4 | 16 st, 220 mm | identical | none |
| Root and third only | G♯3 B♯4 | 4 st, 55 mm | subset | omits D× |

## One-edit neighbors

| Becomes | Edit | Changes | Common tones |
| --- | --- | --- | --- |
| G♯aug7 | 1 3 ♯5 ♭7 | adds F♯ | 3 |
| G♯ | 1 3 5 | D× becomes D♯ | 2 |
| G♯maj7 | 1 3 5 7 | D× becomes D♯, F× | 2 |
| G♯7 | 1 3 5 ♭7 | D× becomes D♯, F♯ | 2 |
| G♯6 | 1 3 5 6 | D× becomes D♯, E♯ | 2 |
| G♯add9 | 1 3 5 9 | D× becomes D♯, A♯ | 2 |
| G♯m | 1 ♭3 5 | B♯, D× becomes B, D♯ | 1 |
| G♯dim | 1 ♭3 ♭5 | B♯, D× becomes B, D | 1 |
| G♯sus2 | 1 2 5 | B♯, D× becomes A♯, D♯ | 1 |
| G♯sus4 | 1 4 5 | B♯, D× becomes C♯, D♯ | 1 |

## Set theory

- Absolute pitch classes: {8, 0, 4}
- Relative pitch classes: [0, 4, 8]
- Normal order: [0, 4, 8]
- Prime form: (048)
- Forte number: 3-12
- Interval vector: <000300>

## Frequencies (close root position)

| Note | MIDI | Frequency |
| --- | --- | --- |
| G♯3 | 56 | 207.65 Hz |
| B♯4 | 60 | 261.63 Hz |
| D×4 | 64 | 329.63 Hz |

## Questions and answers

### What notes are in G♯aug?

G♯aug contains G♯, B♯ and D×. The formula is 1, 3, ♯5.

### How do you play G♯aug on piano?

Play G♯, B♯ and D× together. Right hand fingers 1, 3, 5; left hand 5, 3, 1. G♯ is a black key; B♯ and D× are white.

### What are the inversions of G♯aug?

3 positions: root position G♯ B♯ D×, G♯aug/B♯, G♯aug/D×.

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

Adds F♯. 3 of the notes are shared.

### What is an easy G♯aug for small hands?

The root and third only voicing, G♯3 B♯4, spans 4 semitones or about 55 mm.

### What are the frequencies of G♯aug?

From G♯3 at A440 in 12-TET: 207.65, 261.63, 329.63 Hz.

### What is the set class of G♯aug?

Prime form (048), Forte 3-12, interval vector &lt;000300&gt;.

### How do I transpose G♯aug to another key?

Keep the 1, 3, ♯5 formula on the new root. Caug is C, E, G♯; D♭aug is D♭, F, A.

### Is A♭aug the same as G♯aug?

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:g-sharp
Last reviewed: 2026-08-12