Cdim 7-string bass chord

How to play Cdim on 7-string bass

The most common way, the first shape above: lay your index finger flat across the four strings from the A to the C at the 3rd fret, your ring finger on the D string at the 4th fret and your little finger on the G string at the 5th fret. Don’t play the B, E and F strings.

From the B string x x 3 4 5 3 x (x: not played, 0: open)

What notes are in Cdim?

Cdim, 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 Cdim, Cm7♭5 and Cdim7?

Cdim is three notes, C, E♭ and G♭. Cm7♭5 adds the minor seventh, B♭; Cdim7 adds the diminished seventh, B♭♭, a half step lower.

Where does Cdim 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 Cdim

Cdim is the vii° chord in D♭ major and the ii° chord in B♭ minor.