Chords
Bb Dominant ninth
Bb · D · F · Ab · C
The dominant ninth — a dominant seventh with a major ninth added. Fuller, and a shade less aggressive.
Bb Dominant ninth
Bb · D · F · Ab · C
Voicings on the piano
| Voicing | Notes | Play it on your instrument |
|---|---|---|
| Closed, root position | Bb3 · D4 · F4 · Ab4 · C5 | |
| Open (drop 2) | Ab3 · Bb3 · D4 · F4 · C5 | |
| Shell | Bb3 · D4 · Ab4 | |
| Rootless | D3 · Ab3 · C4 |
Tap a key or a fret to hear it.
Anatomy
Bb Dominant ninth (Bb9) contains the notes Bb · D · F · Ab · C, each with a role measured as an interval from the root.
Read on: how triads are built · seventh chords · extensions
Inversions
An inversion of Bb Dominant ninth puts a chord tone other than Bb in the bass; the name after the slash is that bass note.
Where it lives
The keys and the scales Bb Dominant ninth belongs to.
In which keys
Bb Dominant ninth is diatonic to 2 keys; the numeral is its degree and the label its harmonic function.
Extensions beyond the seventh count when every note sits in the key.
Scales that contain it
Bb Dominant ninth fits inside these scales, each built on Bb.
- Bb MixolydianBb · C · D · Eb · F · G · Ab
- Bb Lydian DominantBb · C · D · E · F · G · Ab
- Bb Mixolydian b6Bb · C · D · Eb · F · Gb · Ab
- Bb Lydian MinorBb · C · D · E · F · Gb · Ab
- Bb BebopBb · C · D · Eb · F · G · Ab · A
- Bb Bebop MinorBb · C · Db · D · Eb · F · G · Ab
- Bb Composite BluesBb · C · Db · D · Eb · Fb · F · G · Ab
- Bb Messiaen's Mode #3Bb · C · Db · D · E · F · Gb · Ab · A
Understanding the Bb Dominant ninth chord
Names and symbols
Bb9 is the chord symbol for Bb Dominant ninth.
add9, 9 and maj9 are three different chords. add9 adds a ninth to a plain triad with no seventh; 9 is a dominant seventh with a ninth; maj9 is a major seventh with a ninth.
How it is built
On Bb it is Bb · D · F · Ab · C, stacking 1P · 3M · 5P · 7m · 9M. The tritone that drives the dominant is still there; the ninth simply adds width above it.
How it is used
It is the standard funk and soul dominant — the James Brown chord, usually voiced without the root so the bass can own it. In a ii–V–I it makes the V richer without weakening the resolution.
Learn this properly
Chapter 10: Chords: Triads and SeventhsCommon questions
- What notes are in Bb9?
- Bb9 contains Bb · D · F · Ab · C. Name any set of notes with the chord identifier.
- How is a 9 chord different from a 7?
- It adds the major ninth above the dominant seventh. The tritone and the resolution are unchanged; the chord is just wider.
- Do I need to play all five notes?
- No. The fifth is usually dropped first, and in a band the root as well — the third, seventh and ninth carry the sound.
- What notes are in the Bb Dominant ninth chord?
- The Bb Dominant ninth chord contains the notes Bb · D · F · Ab · C: the root Bb with the intervals 1P, 3M, 5P, 7m, 9M stacked above it. Play them together for the chord or one after another for an arpeggio. The lowest note is normally Bb, but any chord tone can take the bass in an inversion.
- What intervals make up the Bb Dominant ninth chord?
- Measured from Bb, the Bb Dominant ninth chord stacks the intervals 1P, 3M, 5P, 7m, 9M. The quality of the third and of the seventh, if there is one, is what gives the chord its character; the rest of the notes colour it. Every interval in the formula links to its own page, with its sound.