Skip to content

Guitar chords · Dominant 7th sharp 9th

B7♯9 chord on guitar (B7#9)

B7♯9 (B sharp 9th) has five notes: B, D♯, F♯, A and C𝄪 (played as D), the , 3, 5, ♭7 and ♯9.

Shapes

How to play B7♯9

Strum a shape to hear it, or pick it one string at a time. R marks the ; the other numbers are the chord tones.

B7♯9 has no common . Play it as the A shape at 2 or the E shape at fret 7. A keeps its fingering anywhere on the neck: slide it up or down and the , on the lowest played string, names the chord.

  • A shape · fret 2

    ××R3♭7♯9BD♯AC𝄪
  • E shape · fret 7

    7fr×R♭73♭7♯9BAD♯AC𝄪
Name a shape you're holding: the chord finder

Notes and formula

What makes B7♯9 dominant 7th sharp 9th

A 7♯9 chord is a chord with a raised 9th on top. The ♯9 sounds like a minor 3rd against the major 3rd, a deliberate clash; the chord is known as the Hendrix chord, at home in blues, funk and rock.

  • 1Root: the note the chord is named after. Keep it.
  • 3Essential: makes the chord what it is. Never drop it.
  • 5Optional: drop it first when you run out of fingers.

The 3rd, the ♭7th and the ♯9th make B7♯9 a sharp 9th chord; you can leave out the 5th.

  1. BRroot
  2. D♯3essential
  3. F♯5optional
  4. A♭7essential
  5. C𝄪♯9essential
EADGBE0135791215BBBBBBBBF♯AC𝄪D♯F♯AC𝄪D♯F♯AC𝄪D♯F♯AC𝄪D♯AC𝄪D♯F♯AC𝄪D♯F♯AC𝄪F♯AC𝄪D♯F♯
  • B, the root
  • Other chord tones

As a V chord, B7♯9 resolves to E or, more often, Em: the V7♯9–i move.

Keys

Keys with B7♯9

B7♯9 fits no major or minor key: its ♯9 (C𝄪, usually written D) rubs against the major 3rd on purpose. It is the sound of blues, funk and rock, played as the I chord of a blues in B or as a V chord resolving to E.

Slash chords

B7♯9 over another bass note

A keeps B7♯9 on top and puts another note in the bass: the letter after the slash is the lowest note you play.

  • B7♯9/D♯

    B7♯9 with its 3rd, D♯, in the bass.

  • B7♯9/F♯

    B7♯9 with its 5th, F♯, in the bass.

  • B7♯9/A

    B7♯9 with its ♭7th, A, in the bass.

Questions

B7♯9, in short

What notes are in the B7♯9 chord?
B7♯9 (B sharp 9th) has five notes: B, D♯, F♯, A and C𝄪 (played as D), the , 3, 5, ♭7 and ♯9.
How do you play B7♯9 on guitar?
B7♯9 has no common . Play it as the A shape at 2 or the E shape at fret 7.
What key is B7♯9 in?
B7♯9 fits no major or minor key: its ♯9 (C𝄪, usually written D) rubs against the major 3rd on purpose. It is the sound of blues, funk and rock, played as the I chord of a blues in B or as a V chord resolving to E.
All guitar chords