G#m7b5 chord
G# half diminished seventh
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>G
F#
G
G#1
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
C
C
C#
Db5
D#
E
F
F#
G
G#
A
A#
B
C
D
E
D#
E
F
F#b7
G
G#
A
A#
B
C
C#
D
D#
E
F#
A
G#
A
A#
Bb3
C
C#
D
D#
E
F
F#
G
G#
A
B
3
5
7
10
The G#m7b5 chord has the formula 1, b3, b5, b7 with notes G#, B, D, F#
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.