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C♯ augmented chord on guitar (C♯aug)
Also called or written C♯aug or C♯+
C♯ augmented contains C♯, E♯, and G♯♯. The 2nd fret shape mutes both E strings and uses a compact four-fret stretch.
How it is built
Formula 1, 3, ♯5
- Root positionC♯–E♯–G♯♯C♯aug×-4-3-2-2-×
- First inversionE♯–G♯♯–C♯C♯aug/E♯1-0-3-2-2-×
- Second inversionG♯♯–C♯–E♯C♯aug/G♯♯×-0-3-2-2-1
How do you play a C♯ augmented chord on guitar?
C♯ augmented is played at the 2nd fret as × 4 3 2 2 ×: pinky finger on the A string at fret 4, ring finger on the D string at fret 3, index finger on the G string at fret 2 and middle finger on the B string at fret 2. The low E and high e strings stay muted.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 6 (E) | muted | — | — |
| 5 (A) | 4 | 4 | C♯ (1) |
| 4 (D) | 3 | 3 | E♯ (3) |
| 3 (G) | 2 | 1 | G♯♯ (♯5) |
| 2 (B) | 2 | 2 | C♯ (1) |
| 1 (e) | muted | — | — |
IntermediateThe pinky must reach the 4th fret on the A string while the index and middle hold the 2nd fret on adjacent strings.
5th fret
C♯ augmented is played at the 5th fret as × × × 6 6 5: middle finger on the G string at fret 6, ring finger on the B string at fret 6 and index finger on the high e string at fret 5. The low E, A and D strings stay muted.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 6 (E) | muted | — | — |
| 5 (A) | muted | — | — |
| 4 (D) | muted | — | — |
| 3 (G) | 6 | 2 | C♯ (1) |
| 2 (B) | 6 | 3 | E♯ (3) |
| 1 (e) | 5 | 1 | G♯♯ (♯5) |
7th fret
C♯ augmented is played at the 7th fret as 9 8 7 × × ×: ring finger on the low E string at fret 9, middle finger on the A string at fret 8 and index finger on the D string at fret 7. The G, B and high e strings stay muted.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 6 (E) | 9 | 3 | C♯ (1) |
| 5 (A) | 8 | 2 | E♯ (3) |
| 4 (D) | 7 | 1 | G♯♯ (♯5) |
| 3 (G) | muted | — | — |
| 2 (B) | muted | — | — |
| 1 (e) | muted | — | — |
9th fret
C♯ augmented is played at the 9th fret as × × 11 10 10 9: pinky finger on the D string at fret 11, middle finger on the G string at fret 10, ring finger on the B string at fret 10 and index finger on the high e string at fret 9. The low E and A strings stay muted.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 6 (E) | muted | — | — |
| 5 (A) | muted | — | — |
| 4 (D) | 11 | 4 | C♯ (1) |
| 3 (G) | 10 | 2 | E♯ (3) |
| 2 (B) | 10 | 3 | G♯♯ (♯5) |
| 1 (e) | 9 | 1 | C♯ (1) |
C♯aug/E♯ inversion
C♯ augmented is played in open position as 1 0 3 2 2 ×: index finger on the low E string at fret 1, pinky finger on the D string at fret 3, middle finger on the G string at fret 2 and ring finger on the B string at fret 2. The A string rings open. The high e string stays muted.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 6 (E) | 1 | 1 | E♯ (3) |
| 5 (A) | open | — | G♯♯ (♯5) |
| 4 (D) | 3 | 4 | E♯ (3) |
| 3 (G) | 2 | 2 | G♯♯ (♯5) |
| 2 (B) | 2 | 3 | C♯ (1) |
| 1 (e) | muted | — | — |
Why it sounds like that
C♯ augmented is built from the formula 1, 3, ♯5. The augmented 5th, G♯♯, is eight semitones above the root and gives the chord its tense, unresolved quality. Compare it to C♯ major, which has a perfect 5th instead.
What goes wrong with C♯ augmented?
- Let the low E string ring; it is not a chord tone.
- Let the high e string ring; it is not a chord tone.
- Flatten the index finger onto the G string and mute it.
When to use it
C♯ augmented works as a passing chord in C♯ major progressions, such as C♯–C♯ augmented–F♯. C♯ augmented suits jazz, blues, and dramatic ballads. Try it before C♯ major or C♯ 7th.
Changing to and from C♯ augmented
- Sliding the shape down one fret to the 1st fret gives C augmented.
- From C♯ augmented, move to C♯ major by lowering the G♯♯ to G♯ on the A string.
Which voicing to use
The 2nd fret position has C♯ in the bass and is the most accessible. The 5th fret shape uses only three strings and is easier for quick changes. The 7th fret shape moves the chord up the neck for a brighter sound.
Other C♯ chords
Common questions
How is C♯ augmented written?
C♯ augmented is written as C♯+ or C♯aug. The ASCII root spelling is C#. It is also spelled D♭ in enharmonic notation for the same sounding root.
What is the difference between C♯ augmented and C♯ major?
C♯ augmented has a G♯♯, while C♯ major has a G♯. The raised fifth creates a tense, unresolved sound.
Can C♯ augmented be used as a substitute for C♯ major?
C♯ augmented can replace C♯ major briefly, especially when moving to a chord like F♯. It adds tension that resolves when the fifth drops back.