Dominant 9th (9)

Dom7 + 9th

Prove it — just do the practice exercise.
G9 Root Position
G (R)B (3)D (5)F (♭7)A (9)
The Dom9 extends Dominant 7:

• R – 3 – 5 – ♭7 – 9

More color than a plain Dom7. Standard in blues, funk, and soul.

Example: G9 = G + B + D + F + A