# C♭ Augmented piano chord (C♭aug)

C♭aug contains C♭, E♭ and G. Two stacked major thirds. E♭ is a black key; C♭ and G are white.

- Canonical page: https://piano.org/chords/augmented/c-flat/
- Entity: chord:augmented:c-flat
- Notes: C♭ E♭ G
- Formula: 1 3 ♯5
- Intervals from root: P1, M3, m6
- Interval stack (semitones): 4 4
- Also written: C♭aug, Cbaug, C♭ augmented
- Parameters: A440, 12-TET, 165 mm octave, spans centre to centre

## Construction

| Degree | Note | Interval from root | Semitones |
| --- | --- | --- | --- |
| 1 | C♭ | Perfect unison | 0 |
| 3 | E♭ | Major third | 4 |
| ♯5 | G | Minor sixth | 8 |

## Fingering

Rest your right hand over the notes with finger 1 on C♭, finger 3 on E♭, finger 5 on G. 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 | C♭ | C♭3 E♭4 G4 | 5/3 | 8 st, 110 mm |
| First inversion (C♭aug/E♭) | E♭ | E♭4 G4 C♭4 | 6/3 | 8 st, 110 mm |
| Second inversion (C♭aug/G) | G | G4 C♭4 E♭5 | 6/4 | 8 st, 110 mm |

## Voicings (5)

| Voicing | Notes | Span | Relation | Omits or adds |
| --- | --- | --- | --- | --- |
| Close, root position | C♭3 E♭4 G4 | 8 st, 110 mm | identical | none |
| Close, first inversion | E♭4 G4 C♭4 | 8 st, 110 mm | identical | none |
| Close, second inversion | G4 C♭4 E♭5 | 8 st, 110 mm | identical | none |
| Open, fifth on top | C♭2 G3 E♭4 | 16 st, 220 mm | identical | none |
| Root and third only | C♭3 E♭4 | 4 st, 55 mm | subset | omits G |

## One-edit neighbors

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

## Set theory

- Absolute pitch classes: {11, 3, 7}
- Relative pitch classes: [0, 4, 8]
- Normal order: [3, 7, 11]
- Prime form: (048)
- Forte number: 3-12
- Interval vector: <000300>

## Frequencies (close root position)

| Note | MIDI | Frequency |
| --- | --- | --- |
| C♭3 | 59 | 246.94 Hz |
| E♭4 | 63 | 311.13 Hz |
| G4 | 67 | 392.00 Hz |

## Questions and answers

### What notes are in C♭aug?

C♭aug contains C♭, E♭ and G. The formula is 1, 3, ♯5.

### How do you play C♭aug on piano?

Play C♭, E♭ and G together. Right hand fingers 1, 3, 5; left hand 5, 3, 1. E♭ is a black key; C♭ and G are white.

### What are the inversions of C♭aug?

3 positions: root position C♭ E♭ G, C♭aug/E♭, C♭aug/G.

### What is the difference between C♭aug and C♭aug7?

Adds B♭♭. 3 of the notes are shared.

### What is an easy C♭aug for small hands?

The root and third only voicing, C♭3 E♭4, spans 4 semitones or about 55 mm.

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

From C♭3 at A440 in 12-TET: 246.94, 311.13, 392.00 Hz.

### What is the set class of C♭aug?

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

### How do I transpose C♭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 Baug the same as C♭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:c-flat
Last reviewed: 2026-08-12