Ab7b5 chord
Ab dominant seventh flat five
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G
Gb
G
Ab1
A
Bb
B
C
Db
D
Eb
E
F
Gb
G
Ab
C
C
Db
Db5
Eb
E
F
Gb
G
Ab
A
Bb
B
C
D
E
Eb
E
F
Gbb7
G
Ab
A
Bb
B
C
Db
D
Eb
E
Gb
A
Ab
A
Bb
B
C3
Db
D
Eb
E
F
Gb
G
Ab
A
C
3
5
7
10
The Ab7b5 chord has the formula 1, 3, b5, b7 with notes Ab, C, D, Gb
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.