B dominant ninth (B9) chord on piano

Looking for the B9 chord on piano? It is a dominant ninth chord (a dominant seventh plus a major ninth), made of five notes: B – D♯ – F♯ – A – C♯.

Full chord: B3 – D♯4 – F♯4 – A4 – C♯5

Chord finder Transposer

What the B9 chord sounds like

A dominant ninth is a dominant seventh with an added major ninth. A fuller, fatter dominant sound – a staple of funk, soul and blues.

Notes of the B9 chord

Degree	Note	Interval from the root
1	B	root
3	D♯	major third (4 semitones)
5	F♯	perfect fifth (7 semitones)
7	A	minor seventh (10 semitones)
9	C♯	major second (2 semitones)

Piano voicings

Chords with five or more notes are rarely played in one hand: the left hand takes the root, the right hand the colour notes. The fifth (and in an eleventh chord the third) is often left out.

Full chord

B3 – D♯4 – F♯4 – A4 – C♯5

Two-hand voicing

B2 – D♯4 – A4 – C♯5 – F♯5

Which keys is it in?

The B9 chord is built from the notes of these keys (for minor keys, both the natural and the harmonic minor are considered):

E major: V9 (dominant)
C♯ minor: VII9

Similar chords and substitutes

If B9 is too hard, or you want a different colour in the same spot, these chords are worth a try.

Substitutes (by function)

F7 – tritone substitute: the same third and seventh, swapped – a jazz favourite
E♭dim7 – diminished seventh on the third: a common stand-in for the dominant
B7 – a simpler dominant
B7sus4 – suspended dominant, less tense
E – where it resolves (V → I)

Simpler versions

B7 – all 4 of its notes are in this chord
Badd9 – all 4 of its notes are in this chord
B – all 3 of its notes are in this chord
Bsus2 – all 3 of its notes are in this chord

Richer versions

B11 – the same chord plus 1 colour note
B13 – the same chord plus 1 colour note

Frequently asked questions

What notes are in the B9 chord?

B, D♯, F♯, A, C♯. The root is B; the intervals of the other notes from the root: major third, perfect fifth, minor seventh, major second.

How do I play the B9 chord on piano?

Play the root with your left hand and the colour notes (third, seventh, ninth) with your right hand – the two-hand voicing above. Stacking all 5 notes in one hand is possible but sounds crowded.

Why do some songbooks write H instead of B?

In German and Central European notation, H is the note B, and B is the note B♭. So a “B” chord in a German or Hungarian songbook is B♭ in English notation, and an “H” chord is B. Always check which notation your chord chart uses.