Finger Positions

Root Note A#

Name A# half-diminished over D

Intervals 1P-3m-5d-7m

Relative Minor Gm

Notes D, A#, C#, E, G#

Aliases A#m7b5, A#ø, A#-7b5, A#h7, A#h

How to play the A#m7b5/D Chord

The A#m7b5/D 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# half-diminished over D is built using the 1P, 3m, 5d, 7m intervals. In the key of A# Major, this chord functions as the I chord.

Common Progressions

In music composition, the A#m7b5/D 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

Minor Blues Locrian Locrian Pentatonic Super Locrian Pentatonic Altered Locrian #2 Locrian 6 Dorian #4 Hungarian Major Flamenco Bebop Locrian Half-Whole Diminished Composite Blues Messiaen's Mode #3 Chromatic

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

Acoustic & Digital Analysis

Digital footprint of the A#m7b5/D chord for MIDI programming and synthesizer sound design.

MIDI Numbers 62, 70, 61, 64, 68

Frequencies (Hz)

293.6647679174076, 466.1637615180899, 277.1826309768721, 329.6275569128699, 415.3046975799451