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B dominant ninth chord
The B9 chord (dominant ninth) is made of the notes B, D♯, F♯, A, C♯. Its formula compared with the major scale is 1 3 5 ♭7 9.
B9
Ninths · 5 notes
Note names
How it is built
| Degree | Note | Interval from the root |
|---|---|---|
| 1 | B | Unison |
| 3 | D♯ | Major third |
| 5 | F♯ | Perfect fifth |
| ♭7 | A | Minor seventh |
| 9 | C♯ | Major ninth |
Inversions
- B9B D♯ F♯ A C♯Root position
Frequently asked questions
- Which notes make up the B9 chord?
- The notes are B, D♯, F♯, A, C♯.
- What is the formula of the B9 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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