C#m7b5 chord
C# half diminished seventh
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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#
Eb3
F
F#
G
G#
A
A#
B
C
C#
D
D#
E
E
A
G#
A
A#
Bb7
C
C#
D
D#
E
F
F#
G
G#
A
B
3
5
7
10
The C#m7b5 chord has the formula 1, b3, b5, b7 with notes C#, E, G, B
The half diminished seventh chord is a variation of the minor seventh chord and is found in pop, R&B and jazz. It is typically used as a versatile passing chord and its feel is defined by the chord that follows it.