Bbm7b5 chord
Bb half diminished seventh
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>G
Gb
G
Abb7
A
Bb
B
C
Db
D
Eb
E
F
Gb
G
Ab
C
C
Dbb3
D
Eb
E
F
Gb
G
Ab
A
Bb
B
C
Db
E
Eb
Eb5
F
Gb
G
Ab
A
Bb
B
C
Db
D
Eb
E
E
A
Ab
A
Bb1
B
C
Db
D
Eb
E
F
Gb
G
Ab
A
Bb
3
5
7
10
The Bbm7b5 chord has the formula 1, b3, b5, b7 with notes Bb, Db, E, Ab
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.