About the C sharp major nine chord
C sharp major nine is used in C sharp Major, where every note it holds is a scale tone. Think of it as a C♯ major ninth chord.
Its notes are C♯, E♯, G♯, B♯, and D♯. The intervals are a major third, a perfect fifth, a major seventh, and a major ninth.
Also called Δ9 and M9. D flat major nine spells the same notes enharmonically. In shorthand it is commonly written C#maj9.
Positions
Notes and intervals
| 1 | C#C♯ | Root |
|---|---|---|
| 2 | E#E♯ | Major 3rd |
| 3 | G#G♯ | Perfect 5th |
| 4 | B#B♯ | Major 7th |
| 5 | D#D♯ | Major 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 stands in for this chord's dominant with a dominant seventh a half step above the root, which slides down by a half step to resolve here.
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