A Augmented Piano Chord
The A Augmented chord contains the notes A, C#, E#, built from the intervals 1 – 3 – #5.
Chord formula
1 – 3 – #5
Active voicing: A – C# – E#
Default voicing. Notes A, C#, E#.A aug
- Notes
- A, C#, E#
- Intervals
- 1, 3, #5
- Also known as
- Aaug, A+
Chord inversions
- CDEE#GABCDEE#GABC#
Practice Chords in A
Related chords
Not sure which chord you are playing?
Play the notes on a piano or MIDI keyboard and the Reverse Chord Finder identifies the chord, its inversion, and any slash-chord name.
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How it is built
A augmented raises the fifth of the major triad by a half step, creating a symmetrical chord built entirely from major thirds. That symmetry means every note can be heard as the root.
Common musical function
Augmented chords create restless, unresolved tension — often used as a passing chord between a major triad and its neighbor, or to add drama right before a resolution.
Beginner practice advice
Practice A in root position until the shape feels automatic. Use the audio button to check your voicing, and drill short changes to neighboring chords in the same key.
Moving into and out of the chord
Look for shared notes with nearby chords in the key — keeping a finger on a common tone makes changes smoother. A Major and A augmented 7 are good starting points for short practice loops — see the full related chords list below for more.
FAQ
- What notes are in a A Augmented chord?
- A A Augmented piano chord uses the notes A, C#, E#.
- How do I practice A on piano?
- Start in root position, listen with the audio button, and practice short changes to related chords in the same key.
- Can I explore A in every key?
- Yes. Open the Interactive Chord Explorer to transpose this chord quality across all twelve roots, or use Practice Mode to drill changes in time.
Ready to practice A Augmented Piano Chord?
Use Go Practice to drill chord changes with a metronome and build muscle memory in this key.