A ninth guitar chord (A9)
A ninth chord adds a ninth to the seventh chord. A rich, groovy sound, typical of funk, soul and blues.
Positions and fingerings
Position 1 fret 5
× muted string · o open string · numbers: fingers (1 index, 2 middle, 3 ring, 4 pinky)
Chord notes
| Note | Interval |
|---|---|
| A | root |
| C♯ (C sharp) | major third |
| E | perfect fifth |
| G | minor seventh |
| B | major ninth |
Formula: 1 – 3 – 5 – b7 – 9 · A – C♯ – E – G – B
A progression with this chord
The basis of blues and funk: the ninth chord on the first degree, then on the fourth.