Gb7(b9) chord
The G-flat dominant minor ninth chord (abbreviated "Gb7(b9) 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 often omitted from the Gb7(b9) chord because it's not always possible to play all notes simultaneously.
Name
G-flat dominant minor ninth chord
Notes
G♭ B♭ D♭ F♭ A♭♭
Intervals
1 3 5 ♭7 ♭9
Chord symbol
G♭7(b9)
Alternative symbol
G♭7b9
Type
Pentad (five-note chord)