B♭add9
Bb Added 9th — a plain triad plus the ninth — colour without the seventh, clean and contemporary.
The keys
B♭ – D – F – C
What's inside B♭add9
| Note | Interval from root | Degree |
|---|---|---|
| B♭ | Root | 1 |
| D | Major 3rd | 3 |
| F | Perfect 5th | 5 |
| C | Major 9th | 9 |
Inversions
| Position | Keys (low → high) |
|---|---|
| Root position | B♭4 – D5 – F5 – C6 |
| 1st inversion | D5 – F5 – C6 – B♭5 |
| 2nd inversion | F5 – C6 – B♭5 – D6 |
| 3rd inversion | C6 – B♭5 – D6 – F6 |
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) | B♭2 – F3 |
| Right (colour) | D5 – C6 |
Where B♭add9 lives
As the I chord
B♭add9 → E♭ → F → B♭add9
The classic I–IV–V–I motion with this chord as home.
In a ii–V–I
Cm7 → F7 → B♭add9
The strongest cadence in harmony, resolving onto this chord.
Put B♭add9 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 →