Finger Positions

A#9/F# diagram
Root Note A#
Name A# dominant ninth over F#
Intervals 1P-3M-5P-7m-9M
Relative Minor Gm
Notes F#, A#, D, F, G#, C
Aliases A#9

How to play the A#9/F# Chord

The A#9/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# dominant ninth over F# is built using the 1P, 3M, 5P, 7m, 9M intervals. In the key of A# Major, this chord functions as the I chord.

Common Progressions

In music composition, the A#9/F# chord is often used to create tension or resolution.

I-V-vi-IV

A# → F → Gm → D#

vi-IV-I-V

Gm → D# → A# → F

The Diatonic Family

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

Triads

A# Cm Dm D# F Gm Adim

7ths

A#maj7 Cm7 Dm7 D#maj7 F7 Gm7 Am7b5

Scale Compatibility

View All Scales
Bebop Mixolydian Mixolydian B6 Lydian Dominant Lydian Minor Bebop Minor Composite Blues Messiaen's Mode #3 Chromatic

* 9 scales found containing the notes F#, A#, D, F, G#, C.

Acoustic & Digital Analysis

Digital footprint of the A#9/F# chord for MIDI programming and synthesizer sound design.

MIDI Numbers 66, 70, 62, 65, 68, 60
Frequencies (Hz)

369.9944227116344, 466.1637615180899, 293.6647679174076, 349.2282314330039, 415.3046975799451, 261.6255653005986