Finger Positions

Root Note A

Name A sixth added ninth over C

Intervals 1P-3M-5P-6M-9M

Relative Minor F#m

Notes C, A, C#, E, F#, B

Aliases A6add9, A6/9, A69, AM69

How to play the A6add9/C Chord

The A6add9/C is a fundamental dominant chord in guitar music. To play this chord correctly, ensure your fingers are placed precisely on the frets indicated in the diagram above.

Music Theory Analysis

From a theoretical perspective, the A sixth added ninth over C is built using the 1P, 3M, 5P, 6M, 9M intervals. In the key of A Major, this chord functions as the I chord.

Common Progressions

In music composition, the A6add9/C chord is often used to create tension or resolution.

I-V-vi-IV

A → E → F#m → D

vi-IV-I-V

F#m → D → A → E

The Diatonic Family

Understanding the "family" of chords that belong to A helps with transposition and ear training.

Triads

A Bm C#m D E F#m G#dim

7ths

Amaj7 Bm7 C#m7 Dmaj7 E7 F#m7 G#m7b5

Scale Compatibility

View All Scales

Major Major Blues Bebop Lydian Mixolydian Lydian Dominant Bebop Minor Bebop Major Ichikosucho Composite Blues Chromatic

* 11 scales found containing the notes C, A, C#, E, F#, B.

Acoustic & Digital Analysis

Digital footprint of the A6add9/C chord for MIDI programming and synthesizer sound design.

MIDI Numbers 60, 69, 61, 64, 66, 71

Frequencies (Hz)

261.6255653005986, 440, 277.1826309768721, 329.6275569128699, 369.9944227116344, 493.8833012561241