C♯dim7 7-string bass chord

How to play C♯dim7 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 4th fret, your middle finger on the D string at the 5th fret, your little finger on the G string at the 6th fret and your ring finger on the F string at the 5th fret. Don’t play the B and E strings.

From the B string x x 4 5 6 4 5 (x: not played, 0: open)

What notes are in C♯dim7?

C♯dim7, C♯ diminished seventh, is C♯, E, G and B♭: the root (C♯), the minor third (E), the diminished fifth (G) and the diminished seventh (B♭). Its formula is 1 ♭3 ♭5 ♭♭7.

Why do four diminished seventh chords have the same notes?

A diminished seventh is minor thirds stacked all the way round, C♯, E, G and B♭, so C♯dim7 has the same notes as the diminished sevenths on E, G and B♭. Any of its notes can be the root.