Finger Positions

Root Note A

Name A over F#

Intervals 1P-4P-5P-7m-9M

Relative Minor F#m

Notes F#, A, D, E, G, B

Aliases A9sus4, A9sus

How to play the A9sus4/F# Chord

The A9sus4/F# 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 over F# is built using the 1P, 4P, 5P, 7m, 9M intervals. In the key of A Major, this chord functions as the I chord.

Common Progressions

In music composition, the A9sus4/F# 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

Minor Bebop Dorian Mixolydian Piongio Mixolydian B6 Bebop Minor Minor Bebop Composite Blues Chromatic

* 10 scales found containing the notes F#, A, D, E, G, B.

Acoustic & Digital Analysis

Digital footprint of the A9sus4/F# chord for MIDI programming and synthesizer sound design.

MIDI Numbers 66, 69, 62, 64, 67, 71

Frequencies (Hz)

369.9944227116344, 440, 293.6647679174076, 329.6275569128699, 391.99543598174927, 493.8833012561241