Gb11 chord
The G-flat dominant eleventh chord (abbreviated "Gb11 chord") is a six-note chord consisting of the notes G♭, B♭, D♭, F♭, A♭, and C♭. The chord is formed by adding an eleventh to a G-flat dominant ninth chord.
In practice, the third (B♭) and fifth (D♭) are often omitted from the Gb11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.
Name
G-flat dominant eleventh chord
Notes
G♭ B♭ D♭ F♭ A♭ C♭
Intervals
1 3 5 ♭7 9 11
Chord symbol
G♭11
Type
Hexad (six-note chord)