A augmented (Aaug) chord on piano

Looking for the Aaug chord on piano? It is an augmented triad (two major thirds), made of three notes: A – C♯ – E♯.

Root position: A3 – C♯4 – E♯4

What the Aaug chord sounds like

An augmented triad is two stacked major thirds. It sounds floating, dreamlike and unresolved, and is often a passing chord (e.g. C → Caug → F or Am).

Notes of the Aaug chord

Degree	Note	Interval from the root
1	A	root
3	C♯	major third (4 semitones)
5	E♯	augmented fifth (8 semitones)

Root position and inversions

An inversion uses the same notes, with a different note at the bottom. When you change chords, choosing the nearest inversion keeps your hand almost still.

Root position

A3 – C♯4 – E♯4

1st inversion

C♯4 – E♯4 – A4

2nd inversion

E♯4 – A4 – C♯5

Which keys is it in?

The Aaug chord is built from the notes of these keys (for minor keys, both the natural and the harmonic minor are considered):

F♯ minor: III+

Similar chords and substitutes

If Aaug is too hard, or you want a different colour in the same spot, these chords are worth a try.

Substitutes (by function)

A – the raised fifth falls back to a perfect fifth
D – as a passing chord it resolves here (V+ → I)

Same notes

C♯aug – the same notes with a different root
Faug – the same notes with a different root

Frequently asked questions

What notes are in the Aaug chord?

A, C♯, E♯. The root is A; the intervals of the other notes from the root: major third, augmented fifth.

How do I play the Aaug chord on piano?

In root position, the right hand usually plays with fingers 1, 3 and 5 (thumb, middle finger, little finger); four-note chords with fingers 1, 2, 3 and 5. The left hand mirrors this: 5, 3, 1. In an inversion the top or bottom note moves to the other side, so your hand moves less when you change chords.

How is the Aaug chord written?

The chord symbol is Aaug, and its full name is A augmented.