Abdim7 chord
Ab diminished seventh
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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
Fbb7
Gb
G
Ab
A
Bb
B
C
Db
D
Eb
E
F
A
Ab
A
Bb
Bb3
C
Db
D
Eb
E
F
Gb
G
Ab
A
B
3
5
7
10
The Abdim7 chord has the formula 1, b3, b5, bb7 with notes Ab, B, D, F
The diminished seventh chord is used in classical and jazz music. It is often formed on the seventh degree and used as a leading-tone chord toward the tonic.