Finger Positions

Root Note A#

Name A# major thirteenth over B

Intervals 1P-3M-5P-7M-9M-13M

Relative Minor Gm

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

Aliases A#maj13, A#Maj13, A#^13

How to play the A#maj13/B Chord

The A#maj13/B 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 thirteenth over B is built using the 1P, 3M, 5P, 7M, 9M, 13M intervals. In the key of A# Major, this chord functions as the I chord.

Common Progressions

In music composition, the A#maj13/B 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 Bebop Major Ichikosucho Chromatic

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

Acoustic & Digital Analysis

Digital footprint of the A#maj13/B chord for MIDI programming and synthesizer sound design.

MIDI Numbers 71, 70, 62, 65, 69, 60, 67

Frequencies (Hz)

493.8833012561241, 466.1637615180899, 293.6647679174076, 349.2282314330039, 440, 261.6255653005986, 391.99543598174927