A seventh flat nine chord is created by adding a flattened 9th degree to any dominant 7th chord. For example, a C7b9 chord contains the notes C, E, G, Bb and Db (1, 3, 5, b7 and b9). Here are some common open seventh flat 9 chord shapes.
C7b9

Db7b9

D7b9

Eb7b9

E7b9

F7b9

F#7b9

G7b9

A7b9

A7b9

Bb7b9

B7b9
