A7b5 chord
A dominant seventh flat five
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>G
F#
G
G#
A1
A#
B
C
C#
D
D#
E
F
F#
G
A
C
C
C#
D
D#b5
E
F
F#
G
G#
A
A#
B
C
D#
E
D#
E
F
F#
Gb7
G#
A
A#
B
C
C#
D
D#
E
G
A
G#
A
A#
B
C
C#3
D
D#
E
F
F#
G
G#
A
C#
3
5
7
10
The A7b5 chord has the formula 1, 3, b5, b7 with notes A, C#, D#, 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.