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Chord type

Dominant 7th ♯9 Chords on Piano

The dominant 7th ♯9 chord (the famous "Hendrix chord") stacks a major third AND a minor third (written as ♯9) on top of a dominant 7th, creating a grinding, bluesy dissonance that defines rock, funk, and blues-jazz. The ♯9 is enharmonically the same as a minor third, so the chord contains both major and minor qualities simultaneously.

Each key below opens the full reference entry — keyboard diagram, audio, inversions, fingerings, and notation.

Formula: Root – Major 3rd – Perfect 5th – Minor 7th – Augmented 9th

Scale degrees: 1–3–5–♭7–♯9

Sound: Bluesy, gritty, Hendrix, funky

Symbol: 7♯9 (C7♯9)

Major and minor at the same time: The ♯9 (D♯ in C7♯9) is enharmonically E♭, a minor third. So the chord has both E natural (major 3rd) and E♭ (minor 3rd). This clash between major and minor thirds is the source of its raw, bluesy power. Jimi Hendrix built "Purple Haze" on this sound.

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All 18 spellings, ♯ and ♭ keys listed separately.

Dominant 7th ♯9 Chord in All 18 Keys

C Dominant 7th ♯9 ChordNotes: C – E – G – B♭ – D♯

C♯ Dominant 7th ♯9 ChordNotes: C♯ – E♯ – G♯ – B – D♯♯

D♭ Dominant 7th ♯9 ChordNotes: D♭ – F – A♭ – C♭ – E

D Dominant 7th ♯9 ChordNotes: D – F♯ – A – C – E♯

D♯ Dominant 7th ♯9 ChordNotes: D♯ – F♯♯ – A♯ – C♯ – E♯♯

E♭ Dominant 7th ♯9 ChordNotes: E♭ – G – B♭ – D♭ – F♯

E Dominant 7th ♯9 ChordNotes: E – G♯ – B – D – F♯♯

F Dominant 7th ♯9 ChordNotes: F – A – C – E♭ – G♯

F♯ Dominant 7th ♯9 ChordNotes: F♯ – A♯ – C♯ – E – G♯♯

G♭ Dominant 7th ♯9 ChordNotes: G♭ – B♭ – D♭ – F♭ – A

G Dominant 7th ♯9 ChordNotes: G – B – D – F – A♯

G♯ Dominant 7th ♯9 ChordNotes: G♯ – B♯ – D♯ – F♯ – A♯♯

A♭ Dominant 7th ♯9 ChordNotes: A♭ – C – E♭ – G♭ – B

A Dominant 7th ♯9 ChordNotes: A – C♯ – E – G – B♯

A♯ Dominant 7th ♯9 ChordNotes: A♯ – C♯♯ – E♯ – G♯ – B♯♯

B♭ Dominant 7th ♯9 ChordNotes: B♭ – D – F – A♭ – C♯

B Dominant 7th ♯9 ChordNotes: B – D♯ – F♯ – A – C♯♯

C♭ Dominant 7th ♯9 ChordNotes: C♭ – E♭ – G♭ – B♭♭ – D