F#dim7 chord
F# diminished seventh
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G
F#
G
G#
Ab3
A#
B
C
C#
D
D#
E
F
F#
G
A
C
C
C#
D
D#bb7
E
F
F#
G
G#
A
A#
B
C
D#
E
D#
E
F
F#1
G
G#
A
A#
B
C
C#
D
D#
E
F#
A
G#
A
A#
B
Cb5
C#
D
D#
E
F
F#
G
G#
A
C
3
5
7
10
The F#dim7 chord has the formula 1, b3, b5, bb7 with notes F#, A, C, D#
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.