The C♯ Augmented 7th chord is a four-note chord made up of C♯, E♯, G♯♯, and B. It is built from a root, major third, augmented fifth, and minor seventh.
Construction
C♯ Augmented 7th = Root + Major 3rd + Minor 6th + Minor 7th = C♯ · E♯ · G♯♯ · B
| Note | Interval | Degree |
|---|---|---|
| C♯ | Root | 1 |
| E♯ | Major 3rd | 3 |
| G♯♯ | Minor 6th | ♯5 |
| B | Minor 7th | ♭7 |
C♯ Augmented 7th Inversions
| Position | Notes |
|---|---|
| Root Position | C♯ – E♯ – G♯♯ – B |
| 1st Inversion | E♯ – G♯♯ – B – C♯ |
| 2nd Inversion | G♯♯ – B – C♯ – E♯ |
| 3rd Inversion | B – C♯ – E♯ – G♯♯ |
Key Signature
A Augmented 7th chord is built from symmetrical or ambiguous intervals, so it doesn’t belong to a single key and has no key signature of its own.
Same Notes, Other Names
The notes C♯ – E♯ – G♯♯ – B aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell:
C♯ Augmented 7th — Frequently Asked Questions
What is the C♯ Augmented 7th chord on piano?
The C♯ Augmented 7th chord contains the notes C♯ – E♯ – G♯♯ – B. On piano, play these notes together to sound the chord.
What notes are in the C# Augmented 7th chord?
C# Augmented 7th is built from the C# root. Check the interactive keyboard above for exact notes and fingering.
How is the C# Augmented 7th chord used in music?
C# Augmented 7th appears in jazz, pop, and classical contexts. Its sound depends on the chord quality (Augmented 7th).
What is the fingering for C# Augmented 7th?
See the fingering chart above. Right hand typically uses thumb on root. Left hand uses pinky on root.
What are the inversions of C# Augmented 7th?
Use the inversion buttons above to see each inversion with notes, fingering, and staff notation.