Gbadd11 chord
Gb added eleventh
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>G
Gb
G
Ab
A
Bb3
B
C
Db
D
Eb
E
F
Gb
G
Bb
C
C
Db5
D
Eb
E
F
Gb
G
Ab
A
Bb
B
C
Db
E
Eb
E
F
Gb1
G
Ab
A
Bb
B
C
Db
D
Eb
E
Gb
A
Ab
A
Bb
B11
C
Db
D
Eb
E
F
Gb
G
Ab
A
B
3
5
7
10
The Gbadd11 chord has the formula 1, 3, 5, 11 with notes Gb, Bb, Db, B
The added eleventh chord can be built by taking a major chord and adding the 11th of the scale. It is somewhat dissonant because the 3rd and 11th are one semitone apart.