C♯7♯9
C♯7♯9 is the c# dominant 7th sharp 9 chord, spelled C♯ – E♯ – G♯ – B – E. major and minor thirds colliding in one chord — gritty, electric, built for emphatic moments.
The keys
C♯ – E♯ – G♯ – B – E
Practise this chord
Plug in your MIDI keyboard and let Coach Tshepho drill you on C♯7♯9 — it plays the chord, names any wrong notes as you play, and moves you on when you nail it.
Create your free account →What's inside C♯7♯9
| Note | Interval from root | Degree |
|---|---|---|
| C♯ | Root | 1 |
| E♯ | Major 3rd | 3 |
| G♯ | Perfect 5th | 5 |
| B | Minor 7th | b7 |
| E (spelled D♯♯) | Sharp 9th | #9 |
A working voicing
Split the chord between two hands the way working players do — a solid shell low down, the colour tones up top:
| Hand | Keys |
|---|---|
| Left (shell) | D♭2 – B2 |
| Right (colour) | F4 – E5 |
Where C♯7♯9 lives
Hard resolution
C♯7♯9 → G♭m9
Altered dominants resolve with maximum drama — especially into minor.
Chromatic approach
A♭m7 → C♯7♯9 → G♭
The alteration sharpens the pull of the standard two-five.
Put C♯7♯9 under your fingers
Hear every voicing, see the keys light up, and drill it in the interactive Chord & Voicing Lab.
Open the Chord & Voicing Lab →More C# chords
C♯
C♯m
C♯dim
C♯aug
C♯sus2
C♯sus4
C♯6
C♯m6
C♯7
C♯maj7
C♯m7
C♯m7♭5
C♯dim7
C♯m(maj7)
C♯9
C♯maj9
C♯m9
C♯add9
C♯6/9
C♯m11
C♯13
C♯7♭9
C♯7♯5Play it over a groove
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