The A Augmented 7th chord is a four-note chord made up of A, C♯, E♯, and G. It is built from a root, major third, augmented fifth, and minor seventh.
Construction
A Augmented 7th = Root + Major 3rd + Minor 6th + Minor 7th = A · C♯ · E♯ · G
| Note | Interval | Degree |
|---|---|---|
| A | Root | 1 |
| C♯ | Major 3rd | 3 |
| E♯ | Minor 6th | ♯5 |
| G | Minor 7th | ♭7 |
A Augmented 7th Inversions
| Position | Notes |
|---|---|
| Root Position | A – C♯ – E♯ – G |
| 1st Inversion | C♯ – E♯ – G – A |
| 2nd Inversion | E♯ – G – A – C♯ |
| 3rd Inversion | G – A – C♯ – E♯ |
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 A – C♯ – E♯ – G aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell:
A Augmented 7th — Frequently Asked Questions
What is the A Augmented 7th chord on piano?
The A Augmented 7th chord contains the notes A – C♯ – E♯ – G. On piano, play these notes together to sound the chord.
What notes are in the A Augmented 7th chord?
The A Augmented 7th chord (A+7) contains four notes: A (root), C# (major third), E# (augmented fifth, enharmonically F), and G (minor seventh). It combines an augmented triad with a minor seventh.
How does A Augmented 7th differ from A Dominant 7th?
Both contain A, C#, and G. A+7 has E#/F (augmented fifth) while A7 has E (perfect fifth). The raised fifth adds extra chromatic tension and upward pull.
How is A Augmented 7th used in music?
A+7 is an altered dominant resolving to D Major. The E#/F pulls up to F# while G pulls down to F# — converging on the third of D. Common in jazz, blues, and gospel contexts.
What genres use Augmented 7th chords?
Augmented 7th chords are common in jazz, gospel, blues, and R&B for adding emotional intensity to dominant resolutions.
What songs use Augmented 7th chords?
Augmented 7th chords appear in jazz standards and gospel. A+7 resolves to D Major, one of the most common keys in acoustic and popular music.
What is the difference between +7 and 7#5?
They are the same chord. A+7, A7#5, and Aaug7 all refer to A Augmented 7th.