Abm7b5 chord
Ab half diminished seventh
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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
Bb3
C
Db
D
Eb
E
F
Gb
G
Ab
A
B
3
5
7
10
The Abm7b5 chord has the formula 1, b3, b5, b7 with notes Ab, B, D, Gb
The half diminished seventh chord is a variation of the minor seventh chord and is found in pop, R&B and jazz. It is typically used as a versatile passing chord and its feel is defined by the chord that follows it.