Finger Positions

Root Note A#

Name A# major ninth over F#

Intervals 1P-3M-5P-7M-9M

Relative Minor Gm

Notes F#, A#, D, F, A, C

Aliases A#maj9, A#Δ9, A#^9

How to play the A#maj9/F# Chord

The A#maj9/F# is a fundamental major 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# major 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#maj9/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

Major Bebop Lydian Harmonic Major Bebop Major Ichikosucho Messiaen's Mode #3 Chromatic

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

Acoustic & Digital Analysis

Digital footprint of the A#maj9/F# chord for MIDI programming and synthesizer sound design.

MIDI Numbers 66, 70, 62, 65, 69, 60

Frequencies (Hz)

369.9944227116344, 466.1637615180899, 293.6647679174076, 349.2282314330039, 440, 261.6255653005986