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B♭ add 9 chord on bass (B♭add9)
Also called or written B♭add9, B♭ or B♭ Add 9th
B♭ add 9 is built from B♭, D, F, and C. This advanced voicing uses an open D string, creating a wide stretch across the neck.
How it is built
Formula 1, 3, 5, 9
How do you play a B♭ add 9 chord on bass?
B♭ add 9 is played in open position as 1 3 0 3: index finger on the E string at fret 1, middle finger on the A string at fret 3 and ring finger on the G string at fret 3. The D string rings open.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 4 (E) | 1 | 1 | F (5) |
| 3 (A) | 3 | 2 | C (2) |
| 2 (D) | open | — | D (3) |
| 1 (G) | 3 | 3 | B♭ (1) |
AdvancedThe hardest part is holding the 1st fret on the 4th string while reaching to the 3rd fret on the 3rd and 1st strings without muting the open 2nd string.
B♭add9/C inversion
B♭ add 9 is played at the 7th fret as 8 8 8 7: middle finger on the E string at fret 8, ring finger on the A string at fret 8, pinky finger on the D string at fret 8 and index finger on the G string at fret 7.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 4 (E) | 8 | 2 | C (2) |
| 3 (A) | 8 | 3 | F (5) |
| 2 (D) | 8 | 4 | B♭ (1) |
| 1 (G) | 7 | 1 | D (3) |
Why it sounds like that
B♭ add 9 combines a B♭ major triad with the ninth, C: 1, 3, 5, 9. The ninth adds a gentle dissonance that resolves well to the root. Contrast with B♭ major, which has only B♭, D, and F.
What goes wrong with B♭ add 9?
- Letting the middle finger flatten and mute the open 2nd string.
- Pressing too hard with the index finger and sharpening the F.
When to use it
B♭ add 9 functions as a tonic in B♭ major, often in the I–IV–V–I progression: B♭ major–E♭ major–F major–B♭ major. It fits gospel, R&B, and smooth jazz where the ninth adds warmth.
Changing to and from B♭ add 9
- Move to B♭ major by lifting the ring finger and playing the 1st string open.
Which voicing to use
The B♭add9/F inversion places the fifth in the bass, giving a grounded but slightly suspended feel. Use it when you want the chord to sit firmly in the mix.
Other B♭ chords
Common questions
How is B♭ add 9 written?
B♭ add 9 is written as B♭ or B♭add9. The ASCII root is Bb, so you may see Bbadd9. It is also spelled A♯ in enharmonic notation for the same sounding root.
What is the difference between B♭ add 9 and B♭ major 7?
B♭ add 9 contains the ninth (C) but no seventh, while B♭ major 7 contains the seventh (A) but no ninth. B♭ add 9 sounds more open and less jazzy.
Can B♭ add 9 be played in higher registers?
Yes, the B♭add9/C inversion at fret 8 places C in the bass and sounds brighter. It works well for melodic passages.