Ddim7 chord
D diminished seventh
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G
F#
G
G#b5
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
C
C
C#
D1
D#
E
F
F#
G
G#
A
A#
B
C
D
E
D#
E
Fb3
F#
G
G#
A
A#
B
C
C#
D
D#
E
F
A
G#
A
A#
Bbb7
C
C#
D
D#
E
F
F#
G
G#
A
B
3
5
7
10
The Ddim7 chord has the formula 1, b3, b5, bb7 with notes D, F, G#, B
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.