# G♭ Augmented piano chord (G♭aug)

G♭aug contains G♭, B♭ and D. Two stacked major thirds. G♭ and B♭ are black keys; D is white.

- Canonical page: https://piano.org/chords/augmented/g-flat/
- Entity: chord:augmented:g-flat
- Notes: G♭ B♭ D
- Formula: 1 3 ♯5
- Intervals from root: P1, M3, m6
- Interval stack (semitones): 4 4
- Also written: G♭aug, Gbaug, 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♭3 D4 | 5/3 | 8 st, 110 mm |
| First inversion (G♭aug/B♭) | B♭ | B♭3 D4 G♭4 | 6/3 | 8 st, 110 mm |
| Second inversion (G♭aug/D) | D | D4 G♭4 B♭4 | 6/4 | 8 st, 110 mm |

## Voicings (5)

| Voicing | Notes | Span | Relation | Omits or adds |
| --- | --- | --- | --- | --- |
| Close, root position | G♭3 B♭3 D4 | 8 st, 110 mm | identical | none |
| Close, first inversion | B♭3 D4 G♭4 | 8 st, 110 mm | identical | none |
| Close, second inversion | D4 G♭4 B♭4 | 8 st, 110 mm | identical | none |
| Open, fifth on top | G♭2 D3 B♭3 | 16 st, 220 mm | identical | none |
| Root and third only | G♭3 B♭3 | 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: {6, 10, 2}
- Relative pitch classes: [0, 4, 8]
- Normal order: [2, 6, 10]
- Prime form: (048)
- Forte number: 3-12
- Interval vector: <000300>

## Frequencies (close root position)

| Note | MIDI | Frequency |
| --- | --- | --- |
| G♭3 | 54 | 185.00 Hz |
| B♭3 | 58 | 233.08 Hz |
| D4 | 62 | 293.66 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♭ and B♭ are black keys; D is 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♭3, spans 4 semitones or about 55 mm.

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

From G♭3 at A440 in 12-TET: 185.00, 233.08, 293.66 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 F♯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-flat
Last reviewed: 2026-08-12