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C Augmented Chord: Guitar, Piano and Notes

The C Augmented chord is built on the root note C. Its notes are C, E and G♯.

Transpose
Quality
Short answer

Augmented chords feel floaty and uncertain. Raising the fifth of a major triad creates a symmetrical chord with no clear home, which suits transitions and dreamy film score moments.

Notes
C · E · G♯
Formula
1 · 3 · ♯5
Semitones
0 · 4 · 8
Note
C
Quality
Augmented
Symbol
C+

C Augmented on piano

3 notes
View:
Piano diagram of the C Augmented chord

Switch to the interactive diagram to hear the chord, change voicing and swap finger numbers for note names.

To play C Augmented on piano, place your right hand with your thumb on C, middle finger on E and little finger on G♯. Press the keys together and listen for an even sound. On the keyboard G♯ is a black key and C and E are white. Practice moving in and out of the chord slowly, then bring in a metronome.

  • C1
  • E3
  • G♯♯5

C Augmented on guitar

View:
Guitar chord diagram of the C Augmented chord

Switch to the interactive diagram to hear the chord, change voicing and swap finger numbers for note names.

On guitar, C Augmented is commonly played with the voicing shown above. This one is a barre at fret 8: keep the index finger flat across the strings and curve the others so they don't mute the strings next to them.

C · E · G♯

Try C Augmented on the virtual piano

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C Augmented chord notes

DegreeIntervalSemitonesNoteHear
1Root0C
3Major third4E
♯5Augmented fifth8G♯(G#)

How to use the C Augmented chord

The C Augmented chord is built from a root, a major third and an augmented fifth. Start at the root C and stack the intervals to get the whole chord: C, E and G♯. The same formula gives you the chord in any other key.

Augmented chords show up in jazz, bossa nova, film scores and psychedelic rock. They're often used as a brief transition chord, for example between I and vi in a major key.

How C Augmented differs from similar chords

C+ raises the fifth of C by a half step, so it stacks two major thirds and has no perfect fifth at all. That makes it the mirror image of C°, which stacks two minor thirds. Because three major thirds split the octave evenly, the same three notes form an augmented chord on each of them.

Where C Augmented is used

An augmented chord is unstable by construction: it turns up as a passing tonic inside a descending line, and as a dominant sharpened to pull harder.

In a descending line clichéC major
  1. IC
  2. I+C+
  3. viAm
  4. IVF

The descending line cliché: the fifth of the tonic rises a semitone, then falls into the third of the vi.

As an altered dominantF major
  1. V+C+
  2. IF

Raising the fifth of the dominant sharpens its pull into F.

Scales that contain C+

These scales include C+ as one of their diatonic chords. Use them to find melodies and improvisation ideas that fit perfectly.

Questions people ask

What notes are in the C Augmented chord?
The C Augmented chord contains C, E and G♯ (C, E and G# in plain text).
Is the C Augmented chord major or minor?
C Augmented is a augmented chord. Augmented chords feel floaty and uncertain. Raising the fifth of a major triad creates a symmetrical chord with no clear home, which suits transitions and dreamy film score moments.
How do you play C Augmented on piano?
Place your fingers on C, E and G♯ and play them together. The root usually goes to the little finger of the left hand, the upper notes to the right. On the keyboard G♯ is a black key and C and E are white.
How do you play C Augmented on guitar?
Use the fingering in the diagram above. This one is a barre at fret 8: keep the index finger flat across the strings and curve the others so they don't mute the strings next to them.
What chords work well with C Augmented?
C Augmented pairs naturally with the chords in the related section: a perfect fifth up or down, the relative major or minor, and anything sharing two notes with it.