Aaug Augmented Chord

A major triad with a raised fifth. Creates a mysterious, unsettled sound.

Aaug Chord — Quick Answer & Harmonic Definition

The Aaug (Augmented) chord consists of the notes A, C#, F. It is constructed from the root note A using the augmented interval formula (0–4–8 semitones).

Formula: 0 – 4 – 8

Notes

A – C# – F

Intervals (semitones)

0 – 4 – 8

Type

Triad

Aaug on Piano

Press highlighted keys simultaneously to play the Aaug chord.

A (Root (R))

C# (Major 3rd)

F (Augmented 5th (♯5))

Aaug on Guitar

The Aaug chord uses notes A, C#, F. Build a voicing by finding these notes on any strings — root on the 6th string is a common starting point for barre chord shapes.

Interval Analysis

Degree	Interval Name	Semitones	Note in A
Root	Root (R)	0	A
3rd	Major 3rd	4	C#
5th	Augmented 5th (♯5)	8	F

About the A Augmented Chord

The Aaug chord (A Augmented) consists of 3 notes: A, C#, F. A major triad with a raised fifth. Creates a mysterious, unsettled sound.

To build any augmented chord, apply intervals of 0, 4, 8 semitones above the root. Starting from A: the notes land on A, C#, F.

Playing Aaug on Piano

Press A, C#, F simultaneously. In root position, A is lowest. First inversion places C# in the bass for a lighter sound; second inversion uses F as the bass note.

Common Chord Progressions Using Aaug

I–IV–V: Aaug – Daug – Eaug (blues and rock)
I–V–vi–IV: Aaug – E – F#m – D (pop staple)
I–vi–IV–V: Aaug – F#m – D – E (50s progression)

The Aaug Chord in Context

The Aaug (Augmented) chord features a distinctive a major triad with a raised fifth. creates a mysterious, unsettled sound. built from the intervals 0–4–8. It provides rich harmonic color and tension across pop, jazz, classical, and contemporary compositions.

Other A Chords

Augmented Chord in All 12 Keys

Caug C#aug Daug D#aug Eaug Faug F#aug Gaug G#aug Aaug A#aug Baug

Find songs using Aaug

Knowledge Base & FAQs

Aaug Chord — Frequently Asked Questions

Everything you need to know about our browser-based Web Audio engine, instruments, and music theory workspace.

What notes are in the Aaug chord?

The A Augmented chord contains: A, C#, F.

These notes are derived by applying the augmented interval formula (0–4–8 semitones) to the root note A.

What is the Aaug chord used for?

A major triad with a raised fifth.

Creates a mysterious, unsettled sound. The Aaug chord is used across pop, rock, jazz, and classical music. As the I chord in the key of A major, it functions as the most stable resting point in progressions.

How do you play Aaug on piano?

On piano, play A, C#, F simultaneously.

In root position, A is the lowest note. Inversions move the bass note up — first inversion has C# lowest, second inversion has F lowest.

How many notes are in a augmented chord?

A augmented chord has 3 notes: A, C#, F (in A).

It is a triad — the most fundamental chord type.

What is the difference between A major and A minor?

The A major chord (A–C#–E) uses a major third (4 semitones), giving it a bright, happy sound.

The A minor chord (A–C–E) uses a minor third (3 semitones), giving it a darker, emotional sound.

What key does Aaug belong to?

Aaug naturally serves as the I chord in the key of A major.

It also appears as IV in the key of E major, and as V in the key of D major.

Can I play Aaug on ukulele?

Yes.

The ukulele uses GCEA tuning with 4 strings. The Aaug chord notes (A, C#, F) can be fretted on a ukulele, though the shapes differ from guitar due to the 4-string layout and shorter scale.

What chords go well with Aaug?

In the key of A major, Aaug pairs naturally with D major (IV), E major (V), and F#m (vi).

The classic I–IV–V (Aaug–D–E) is the foundation of blues, country, and rock.

What is a chord inversion of Aaug?

An inversion places a non-root note in the bass.

Aaug root position: A in bass. First inversion: C# in bass. Second inversion: F in bass. Inversions create smoother bass line movement without changing the harmony.

How do I memorize the notes in a augmented chord?

Remember the formula: 0–4–8 semitones from root.

For Aaug: start on A, add 4 semitones, then 8 semitones. Practicing this across all 12 roots builds instant recognition of any augmented chord.