C♯maj9
C# Major 9th — the maj7 opened up with a ninth — wide, modern, and glassy; a staple of contemporary keys playing.
The keys
C♯ – E♯ – G♯ – B♯ – D♯
What's inside C♯maj9
| Note | Interval from root | Degree |
|---|---|---|
| C♯ | Root | 1 |
| E♯ | Major 3rd | 3 |
| G♯ | Perfect 5th | 5 |
| B♯ | Major 7th | 7 |
| D♯ | Major 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 – C3 |
| Right (colour) | F4 – E♭5 |
Where C♯maj9 lives
As the i chord
C♯maj9 → A → B → C♯maj9
The minor home base: i–VI–VII pulls away and lands back home.
In a ii–V–i
E♭m7♭5 → A♭7 → C♯maj9
The minor two-five resolving into this chord as the destination.
Put C♯maj9 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 →