Explore chords · Bass
C♯ add 9 chord on bass (C♯add9)
Also called or written C♯add9, C♯ or C♯ Add 9th
C♯ add 9 is built from C♯, E♯, G♯, and D♯. This advanced voicing sits high on the neck, demanding precise finger placement.
C♯add9/D♯ inversionfrom fret 10
How it is built
Formula 1, 3, 5, 9
- Root positionC♯–E♯–G♯–D♯C♯add9no shape on this instrument
- First inversionE♯–G♯–D♯–C♯C♯add9/E♯no shape on this instrument
- Second inversionG♯–D♯–C♯–E♯C♯add9/G♯no shape on this instrument
- Third inversionD♯–C♯–E♯–G♯C♯add9/D♯11-11-11-10
How do you play a C♯ add 9 chord on bass?
C♯ add 9 is played at the 10th fret as 11 11 11 10: middle finger on the E string at fret 11, ring finger on the A string at fret 11, pinky finger on the D string at fret 11 and index finger on the G string at fret 10.
Full note and interval breakdown
| String | Fret | Finger | Note |
|---|---|---|---|
| 4 (E) | 11 | 2 | D♯ (2) |
| 3 (A) | 11 | 3 | G♯ (5) |
| 2 (D) | 11 | 4 | C♯ (1) |
| 1 (G) | 10 | 1 | E♯ (3) |
AdvancedThe stretch between the index finger on the 10th fret and the pinky on the 11th fret of the D string is wide.
Why it sounds like that
C♯ add 9 uses the formula 1, 3, 5, 9. The major 2nd between C♯ and D♯ adds the ninth, while the major 3rd from C♯ to E♯ gives the major quality. Compare it with C♯ major, which omits the ninth.
What goes wrong with C♯ add 9?
- Letting the index finger mute the G string by collapsing.
- Pressing too hard with the pinky, causing the D string to buzz.
When to use it
C♯ add 9 is the tonic in C♯ major, fitting the I–IV–V–I progression: C♯ major–F♯ major–G♯ major–C♯ major. It suits rock, pop, and gospel styles where the ninth adds brightness. It also works over C♯ major and C♯ 5th chords.
Changing to and from C♯ add 9
- Slide the shape down one fret to the 9th fret for C add 9.
- Move to C♯ major by lifting the index finger and playing the open C♯ string.
Which voicing to use
The default voicing places D♯ in the bass, softening the root emphasis. Use this inversion when the bass line needs to connect stepwise or when the root is covered by another instrument.
Other C♯ chords
Common questions
How is C♯ add 9 written?
C♯ add 9 is written as C♯add9 or C♯. The ASCII root is C#. It is also spelled D♭ in enharmonic notation for the same sounding root.
How does C♯ add 9 differ from C♯ major?
C♯ add 9 includes the ninth, D♯, which C♯ major omits. The added note creates a brighter, more open sound while keeping the major third.
Can C♯ add 9 be used in minor keys?
C♯ add 9 is diatonic to E♭ natural minor and B♭ natural minor. In those keys it acts as a borrowed major chord, often for modal interchange.