Chords
B Dominant ninth
B · D# · F# · A · C#
The dominant ninth — a dominant seventh with a major ninth added. Fuller, and a shade less aggressive.
B Dominant ninth
B · D# · F# · A · C#
Voicings on the piano
| Voicing | Notes | Play it on your instrument |
|---|---|---|
| Closed, root position | B3 · D#4 · F#4 · A4 · C#5 | |
| Open (drop 2) | A3 · B3 · D#4 · F#4 · C#5 | |
| Shell | B3 · D#4 · A4 | |
| Rootless | D#3 · A3 · C#4 |
Tap a key or a fret to hear it.
Anatomy
B Dominant ninth (B9) contains the notes B · D# · F# · A · 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 B Dominant ninth puts a chord tone other than B in the bass; the name after the slash is that bass note.
Where it lives
The keys and the scales B Dominant ninth belongs to.
In which keys
B 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
B Dominant ninth fits inside these scales, each built on B.
- B MixolydianB · C# · D# · E · F# · G# · A
- B Lydian DominantB · C# · D# · E# · F# · G# · A
- B Mixolydian b6B · C# · D# · E · F# · G · A
- B Lydian MinorB · C# · D# · E# · F# · G · A
- B BebopB · C# · D# · E · F# · G# · A · A#
- B Bebop MinorB · C# · D · D# · E · F# · G# · A
- B Composite BluesB · C# · D · D# · E · F · F# · G# · A
- B Messiaen's Mode #3B · C# · D · D# · E# · F# · G · A · A#
Understanding the B Dominant ninth chord
Names and symbols
B9 is the chord symbol for B 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 B it is B · D# · F# · A · 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 B9?
- B9 contains B · D# · F# · A · 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 B Dominant ninth chord?
- The B Dominant ninth chord contains the notes B · D# · F# · A · C#: the root B 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 B, but any chord tone can take the bass in an inversion.
- What intervals make up the B Dominant ninth chord?
- Measured from B, the B 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.