C♯dim 7-string bass chord

How to play C♯dim on 7-string bass

The most common way, the first shape above: your index finger on the A string at the 4th fret and your middle finger on the C string at the 4th fret. Let the G string ring open. Don’t play the B, E, D and F strings.

From the B string x x 4 x 0 4 x (x: not played, 0: open)

What notes are in C♯dim?

C♯dim, C♯ diminished, is C♯, E and G: the root (C♯), the minor third (E) and the diminished fifth (G). Its formula is 1 ♭3 ♭5.

What is the difference between C♯dim, C♯m7♭5 and C♯dim7?

C♯dim is three notes, C♯, E and G. C♯m7♭5 adds the minor seventh, B; C♯dim7 adds the diminished seventh, B♭, a half step lower.

Where does C♯dim go?

Most often up a half step, to D: it is the chord on the seventh note of a major key, leading back to the tonic.

Keys with C♯dim

C♯dim is the vii° chord in D major and the ii° chord in B minor.