C thirteenth (C13) chord on mandolin

Looking for the C13 chord on mandolin? It is a thirteenth chord (a dominant ninth plus a major thirteenth), made of six notes: C – E – G – B♭ – D – A.

Dots show:

Basic shapemedium

Position 5medium

Position 8easy

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

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What the C13 chord sounds like

A thirteenth chord is a dominant seventh with an added major thirteenth (the sixth an octave up). On an instrument the fifth and often the ninth are dropped, and the eleventh is left out. A classic jazz and blues dominant.

Notes of the C13 chord

Degree	Note	Interval from the root
1	C	root
3	E	major third (4 semitones)
5	G	perfect fifth (7 semitones) – often omitted on fretted instruments
7	B♭	minor seventh (10 semitones)
9	D	major second (2 semitones) – often omitted on fretted instruments
13	A	major sixth (9 semitones)

How to play it – with fingering

Basic shape

String 1 (E): fret 5, little finger (A5)
String 2 (A): fret 3, ring finger (C5)
String 3 (D): fret 2, index finger (E4)
String 4 (G): fret 3, middle finger (B♭3)

Position 5

String 1 (E): fret 6, middle finger (B♭5)
String 2 (A): fret 7, little finger (E5)
String 3 (D): fret 7, ring finger (A4)
String 4 (G): fret 5, index finger (C4)

Position 8

String 1 (E): fret 8, middle finger (C6)
String 2 (A): open (A4)
String 3 (D): fret 8, index finger (B♭4)
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 C13 chord is built from the notes of these keys (for minor keys, both the natural and the harmonic minor are considered):

F major: V13 (dominant)
D minor: VII13

Similar chords and substitutes

If C13 is too hard, or you want a different colour in the same spot, these chords are worth a try.

Substitutes (by function)

F♯7 – tritone substitute: the same third and seventh, swapped – a jazz favourite
Edim7 – diminished seventh on the third: a common stand-in for the dominant
C7 – a simpler dominant
C7sus4 – suspended dominant, less tense
F – where it resolves (V → I)

Simpler versions

C9 – all 5 of its notes are in this chord
C7 – all 4 of its notes are in this chord
C6 – all 4 of its notes are in this chord
Cadd9 – all 4 of its notes are in this chord

Frequently asked questions

What notes are in the C13 chord?

C, E, G, B♭, D, A. The root is C; the intervals of the other notes from the root: major third, perfect fifth, minor seventh, major second, major sixth.

What is the easiest way to play C13 on mandolin?

The easiest shape above is “Position 8”, rated easy. We show 3 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 C13 shapes?

On a fretted instrument you can't always play every note of a 6-note chord. The fifth (G) and ninth (D) may be dropped – the chord keeps its character without them.

How is the C13 chord written?

The chord symbol is C13, and its full name is C thirteenth.