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A dominant ninth chord
The A9 chord (dominant ninth) is made of the notes A, C♯, E, G, B. Its formula compared with the major scale is 1 3 5 ♭7 9.
A9
Ninths · 5 notes
Note names
How it is built
| Degree | Note | Interval from the root |
|---|---|---|
| 1 | A | Unison |
| 3 | C♯ | Major third |
| 5 | E | Perfect fifth |
| ♭7 | G | Minor seventh |
| 9 | B | Major ninth |
Inversions
- A9A C♯ E G BRoot position
Frequently asked questions
- Which notes make up the A9 chord?
- The notes are A, C♯, E, G, B.
- What is the formula of the A9 chord?
- The formula is 1 3 5 ♭7 9: major third, perfect fifth, minor seventh, major ninth.
From theory to practice
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