A#7b5 chord
A# dominant seventh flat five
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>G
F#
G
G#b7
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
C
C
C#
D3
D#
E
F
F#
G
G#
A
A#
B
C
D
E
D#
Eb5
F
F#
G
G#
A
A#
B
C
C#
D
D#
E
E
A
G#
A
A#1
B
C
C#
D
D#
E
F
F#
G
G#
A
A#
3
5
7
10
The A#7b5 chord has the formula 1, 3, b5, b7 with notes A#, D, E, G#
The seventh flat five chord is a variation of the dominant seventh chord. It is sometimes used as a passing chord in jazz tunes to resolve at a major or minor seventh chord one half-step down.