Notechord

A♯7♯9 (the "Hendrix chord") / B♭7♯9 (the "Hendrix chord")

5-note dominant 7th sharp 9 on A♯ / B♭ — A♯, C♯, D, F, G♯.

Press to hear the chord strummed low to high.

The famous "Hendrix chord" — a dominant seventh carrying both the major third and the sharp ninth (an enharmonic minor third), major and minor at once.

The notes

Pitches taken from the first fingering below — click any note to open its frequency page.

Interval formula

DegreeNoteWhat it is
1A♯root
♯9C♯sharp ninth
3Dmajor third
5Fperfect fifth
♭7G♯flat seventh (dominant)

The formula reads in semitones above the root (A♯): 1, ♯9, 3, 5, ♭7. A voicing may leave a tone out — often the fifth — but never adds one from outside this set.

From the same deskKeychord— keyboard shortcuts for every app

Guitar fingerings · 4

123
open position
6fr131244
from fret 6
7fr2134
from fret 7
12fr2134
from fret 12

Ukulele fingerings · 4

24
open position
4fr4213
from fret 4
4fr4211
from fret 4
7fr1243
from fret 7

Read a diagram top-down: the thick bar is the nut, dots are where to press (the number is which finger), means play the open string, means don't play it. A bar across strings is a barre.

Other A♯ / B♭ chords

7♯9 (the "Hendrix chord") chords on every root