Cadd11 chord
C added eleventh
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G
F#
G5
G#
A
A#
B
C
C#
D
D#
E
F
F#
G
G
C
C
C#
D
D#
E3
F
F#
G
G#
A
A#
B
C
E
E
D#
E
F11
F#
G
G#
A
A#
B
C
C#
D
D#
E
F
A
G#
A
A#
B
C1
C#
D
D#
E
F
F#
G
G#
A
C
3
5
7
10
The Cadd11 chord has the formula 1, 3, 5, 11 with notes C, E, G, F
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.