Bdim7 chord
B diminished seventh
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G
F#
G
G#bb7
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
C
C
C#
Db3
D#
E
F
F#
G
G#
A
A#
B
C
D
E
D#
E
Fb5
F#
G
G#
A
A#
B
C
C#
D
D#
E
F
A
G#
A
A#
B1
C
C#
D
D#
E
F
F#
G
G#
A
B
3
5
7
10
The Bdim7 chord has the formula 1, b3, b5, bb7 with notes B, D, F, G#
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.