Gb9 chord
The G-flat dominant ninth chord (abbreviated "Gb9 chord") is a five-note chord consisting of the notes G♭, B♭, D♭, F♭, and A♭. The chord is formed by adding a major ninth to a G-flat dominant seventh chord.
In practice, the fifth (D♭) is sometimes omitted from the Gb9 chord because it's not always possible to play all notes simultaneously.
Name
G-flat dominant ninth chord
Notes
G♭ B♭ D♭ F♭ A♭
Intervals
1 3 5 ♭7 9
Chord symbol
G♭9
Type
Pentad (five-note chord)