A#m7b5 chord
A# half diminished seventh
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G
F#
G
G#b7
A
A#
B
C
C#
D
D#
E
F
F#
G
G#
C
C
C#b3
D
D#
E
F
F#
G
G#
A
A#
B
C
C#
E
D#
Eb5
F
F#
G
G#
A
A#
B
C
C#
D
D#
E
E
A
G#
A
A#1
B
C
C#
D
D#
E
F
F#
G
G#
A
A#
3
5
7
10
The A#m7b5 chord has the formula 1, b3, b5, b7 with notes A#, C#, E, G#
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.