Finger Positions

Root Note B

Name B dominant sharp ninth over A#

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

Relative Minor G#m

Notes A#, B, D#, F#, A, D

Aliases B7#9

How to play the B7#9/A# Chord

The B7#9/A# 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 B dominant sharp ninth over A# is built using the 1P, 3M, 5P, 7m, 9A intervals. In the key of B Major, this chord functions as the I chord.

Common Progressions

In music composition, the B7#9/A# chord is often used to create tension or resolution.

I-V-vi-IV

B → F# → G#m → E

vi-IV-I-V

G#m → E → B → F#

The Diatonic Family

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

Triads

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

7ths

Bmaj7 C#m7 D#m7 Emaj7 F#7 G#m7 A#m7b5

Scale Compatibility

View All Scales

Hungarian Major Flamenco Spanish Heptatonic Bebop Minor Half-Whole Diminished Kafi Raga Composite Blues Messiaen's Mode #3 Chromatic

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

Acoustic & Digital Analysis

Digital footprint of the B7#9/A# chord for MIDI programming and synthesizer sound design.

MIDI Numbers 70, 71, 63, 66, 69, 62

Frequencies (Hz)

466.1637615180899, 493.8833012561241, 311.1269837220809, 369.9944227116344, 440, 293.6647679174076