A#m9b5 Piano Chord: Notes, Inversions and Fingering (A Sharp Half-Diminished Ninth)

How to play A#m9b5

Find A# just below middle C. That is the root.
Add C#, E, G# and C above it, skipping the keys in between.
Right hand fingering: 1-2-3-4-5, or split the chord between both hands. Left hand: play the root and fifth, and leave the upper notes to the right hand.

Notes

A#root

C#b3 · minor third

Eb5 · diminished fifth

G#b7 · minor seventh

C9 · ninth

Notes and theory

A#root

C#b3 · minor third

Eb5 · diminished fifth

G#b7 · minor seventh

C9 · ninth

The m9b5 adds a ninth to a half-diminished chord, used in minor-key jazz. The formula is 1 b3 b5 b7 9. Strictly by music theory the notes are spelled A#, C#, E, G# and B#; B# is the same key as C.

A#m9b5 on ukulele

More A# chords

All A# piano chords

A#major A#mminor A#7dominant seventh A#m7minor seventh A#maj7major seventh A#sus4suspended fourth A#sus2suspended second A#dimdiminished A#augaugmented A#6major sixth A#9dominant ninth A#add9added ninth A#m7b5half-diminished A#dim7diminished seventh A#7sus4dominant seventh suspended fourth A#5power chord A#m6minor sixth A#m9minor ninth

half-diminished ninth chords in every key

Cm9b5 C#m9b5 Dm9b5 D#m9b5 Em9b5 Fm9b5 F#m9b5 Gm9b5 G#m9b5 Am9b5 A#m9b5 Bm9b5

Questions

What notes are in the A#m9b5 chord?

A#m9b5 (A sharp half-diminished ninth) is made of five notes: A# (root), C# (minor third), E (diminished fifth), G# (minor seventh) and C (ninth).

How do you play A#m9b5 on piano?

Play A#, C#, E, G# and C together. With the right hand use fingers 1-2-3-4-5, or split the chord between both hands; with the left hand use play the root and fifth, and leave the upper notes to the right hand.

What does a half-diminished ninth chord sound like?

The m9b5 adds a ninth to a half-diminished chord, used in minor-key jazz.