A sixth (A6) chord on mandolin

The A sixth chord (A6) is a major sixth chord (a major triad plus a major sixth), made of four notes: A – C♯ – E – F♯.

Dots show:

Basic shapeeasy

Position 4easy

Position 7medium

Position 11easy

Tap a string on a diagram to hear just that string. The sound is generated in your browser with a physical string model.

Chord finder Transposer Tuner

What the A6 chord sounds like

A sixth chord is a major triad with an added major sixth. It has a cheerful, vintage swing colour and often stands in for the tonic in jazz and swing. It has the same notes as the relative minor seventh (C6 = Am7).

Notes of the A6 chord

Degree	Note	Interval from the root
1	A	root
3	C♯	major third (4 semitones)
5	E	perfect fifth (7 semitones) – often omitted on fretted instruments
6	F♯	major sixth (9 semitones)

How to play it – with fingering

Basic shape

String 1 (E): open (E5)
String 2 (A): fret 4, little finger (C♯5)
String 3 (D): fret 4, ring finger (F♯4)
String 4 (G): fret 2, index finger (A3)

Position 4, barre at fret 4

String 1 (E): fret 5, middle finger (A5)
String 2 (A): fret 4, index finger (C♯5)
String 3 (D): fret 4, index finger (F♯4)
String 4 (G): fret 6, ring finger (C♯4)

For the barre, lay your index finger flat across all the marked strings at fret 4; your other fingers press the higher frets.

Position 7

String 1 (E): fret 9, little finger (C♯6)
String 2 (A): fret 9, little finger (F♯5)
String 3 (D): fret 7, index finger (A4)
String 4 (G): fret 9, ring finger (E4)

Tuning: G D A E, like a violin; every note is a pair of strings that you fret together. In the diagram, × means the string is not played, and a circle means an open string.

Which keys is it in?

The A6 chord is built from the notes of these keys (for minor keys, both the natural and the harmonic minor are considered):

A major: I6 (tonic)
D major: V6 (dominant)
E major: IV6 (subdominant)
B minor: VII6
F♯ minor: III6
C♯ minor: VI6

Similar chords and substitutes

If A6 is too hard, or you want a different colour in the same spot, these chords are worth a try.

Substitutes (by function)

F♯m – relative minor: two shared notes, a common stand-in for the tonic
C♯m – mediant minor (iii): two shared notes
Amaj7 – a softer, jazzier tonic colour
Asus4 – suspended version that resolves back to this chord

Same notes

F♯m7 – the same notes with a different root

Simpler versions

A – all 3 of its notes are in this chord

Richer versions

A13 – the same chord plus 2 colour notes

Frequently asked questions

What notes are in the A6 chord?

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

What is the easiest way to play A6 on mandolin?

The easiest shape above is “Basic shape”, rated easy. We show 4 shapes, from open and easy versions to movable barre shapes higher up the neck.

How do I read the chord diagram?

Strings run from the lowest (left) to the highest (right) – tick “Left-handed” to mirror it. Rows are frets; a number at the side shows the starting fret. Dots are fingers (1 index, 2 middle, 3 ring, 4 little), a long bar is a barre, × means don't play that string and ○ means play it open.

Why is a note missing from some A6 shapes?

On a fretted instrument you can't always play every note of a 4-note chord. The fifth (E) may be dropped – the chord keeps its character without it.

How is the A6 chord written?

The chord symbol is A6, and its full name is A sixth.