Bbadd11 chord
Bb added eleventh
<
1 / 6
>G
Gb
G
Ab
A
Bb1
B
C
Db
D
Eb
E
F
Gb
G
Bb
C
C
Db
D
Eb11
E
F
Gb
G
Ab
A
Bb
B
C
Eb
E
Eb
E
F5
Gb
G
Ab
A
Bb
B
C
Db
D
Eb
E
F
A
Ab
A
Bb
B
C
Db
D3
Eb
E
F
Gb
G
Ab
A
D
3
5
7
10
The Bbadd11 chord has the formula 1, 3, 5, 11 with notes Bb, D, F, Eb
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.