B9
B Dominant 9th — a dominant seventh widened with the ninth — fuller, funkier movement toward the resolution.
The keys
B – D♯ – F♯ – A – C♯
What's inside B9
| Note | Interval from root | Degree |
|---|---|---|
| B | Root | 1 |
| D♯ | Major 3rd | 3 |
| F♯ | Perfect 5th | 5 |
| A | Minor 7th | b7 |
| C♯ | Major 9th | 9 |
A working voicing
Split the chord between two hands the way working players do — a solid shell low down, the colour tones up top:
| Hand | Keys |
|---|---|
| Left (shell) | B2 – A3 |
| Right (colour) | E♭5 – D♭6 |
Where B9 lives
As the I chord
B9 → E → G♭ → B9
The classic I–IV–V–I motion with this chord as home.
In a ii–V–I
D♭m7 → G♭7 → B9
The strongest cadence in harmony, resolving onto this chord.
Put B9 under your fingers
Hear every voicing, see the keys light up, and drill it in the interactive Chord & Voicing Lab.
Open the Chord & Voicing Lab →