Gbm6 chord
Gb minor sixth
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>G
Gb
G
Ab
Ab3
Bb
B
C
Db
D
Eb
E
F
Gb
G
A
C
C
Db
D
Eb6
E
F
Gb
G
Ab
A
Bb
B
C
Eb
E
Eb
E
F
Gb1
G
Ab
A
Bb
B
C
Db
D
Eb
E
Gb
A
Ab
A
Bb
B
C
Db5
D
Eb
E
F
Gb
G
Ab
A
Db
3
5
7
10
The Gbm6 chord has the formula 1, b3, 5, 6 with notes Gb, A, Db, Eb
The minor sixth chord is found most often in jazz. It can be formed on the tonic in minor progressions, or on the sub-dominant in major progressions.