C#7b5 chord
C# dominant seventh flat five
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G
F#
Gb5
G#
A
A#
B
C
C#
D
D#
E
F
F#
G
G
C
C
C#1
D
D#
E
F
F#
G
G#
A
A#
B
C
C#
E
D#
E
F3
F#
G
G#
A
A#
B
C
C#
D
D#
E
F
A
G#
A
A#
Bb7
C
C#
D
D#
E
F
F#
G
G#
A
B
3
5
7
10
The C#7b5 chord has the formula 1, 3, b5, b7 with notes C#, F, G, B
The seventh flat five chord is a variation of the dominant seventh chord. It is sometimes used as a passing chord in jazz tunes to resolve at a major or minor seventh chord one half-step down.