About the C sharp seven sharp nine chord
C sharp seven sharp nine sits outside the plain diatonic set, so it is borrowed to add color and tension. Think of it as a C♯ dominant seventh sharp nine chord.
Its notes are C♯, E♯, G♯, B, and D♯♯. The intervals are a major third, a perfect fifth, a minor seventh, and an augmented ninth.
Also called Hendrix chord and Purple Haze chord. D flat seven sharp nine spells the same notes enharmonically.
Positions
Notes and intervals
| 1 | C#C♯ | Root |
|---|---|---|
| 2 | E#E♯ | Major 3rd |
| 3 | G#G♯ | Perfect 5th |
| 4 | BB | Minor 7th |
| 5 | D##D♯♯ | Augmented 9th |
Shapes
Chromatic
Circle of Fifths
Other C sharp chords
Simpler triads
Suspended
Sixths and sevenths
Extensions
Altered
Functional relationships
These chords are where this one most naturally comes from and resolves to inside a key.
Relative minor
The relative minor uses the same notes and key signature, so it works as a calmer, darker home base.
Parallel minor
The parallel minor keeps the same root note but lowers the third, giving the same key a darker, sadder sound.
Dominant
The dominant is a fifth above the root, and it builds tension that pulls strongly back to this chord.
Subdominant
The subdominant is a fourth above the root (a fifth below), and it usually leads on to the dominant or back home.
Tritone substitution
The tritone substitution is a dominant chord a tritone away that shares the same tension, so it can stand in for this chord and resolve the same way.
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