Finger Positions

Root Note A#

Name A#

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

Relative Minor Gm

Notes A#, D, F, C

Aliases A#Madd9, A#2, A#add9, A#add2

How to play the A#add9 Chord

The A#add9 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# is built using the 1P, 3M, 5P, 9M intervals. In the key of A# Major, this chord functions as the I chord.

Common Progressions

In music composition, the A#add9 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 Pentatonic Major Major Blues Bebop Lydian Mixolydian Flat Six Pentatonic Mixolydian B6 Lydian Dominant Lydian Minor Harmonic Major Bebop Minor Bebop Major Ichikosucho Composite Blues

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

Acoustic & Digital Analysis

Digital footprint of the A#add9 chord for MIDI programming and synthesizer sound design.

MIDI Numbers 70, 62, 65, 60

Frequencies (Hz)

466.1637615180899, 293.6647679174076, 349.2282314330039, 261.6255653005986