The F-flat dominant ninth chord (abbreviated "Fb9 chord") is a five-note chord consisting of the notes F, A, C, E, and G. The chord is formed by adding a major ninth to a F-flat dominant seventh chord.

In practice, the fifth (C) is sometimes omitted from the Fb9 chord because it's not always possible to play all notes simultaneously.

Name
F-flat dominant ninth chord
Notes
F A C E G
Intervals
1 3 5 7 9
Chord symbol
F9
Type
Pentad (five-note chord)

Fb9 chord on piano

Fb9 chord on guitar

Fb9 chord on ukulele

Fb9 chord on the staff