Gdim7 8-string bass chord

How to play Gdim7 on 8-string bass

The most common way, the first shape above: your index finger on the F♯ string at the 1st fret, your ring finger on the B string at the 2nd fret, your middle finger on the A string at the 1st fret and your little finger on the D string at the 2nd fret. Let the E and G strings ring open. Don’t play the C and F strings.

From the F♯ string 1 2 0 1 2 0 x x (x: not played, 0: open)

What notes are in Gdim7?

Gdim7, G diminished seventh, is G, B♭, D♭ and F♭: the root (G), the minor third (B♭), the diminished fifth (D♭) and the diminished seventh (F♭). 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, G, B♭, D♭ and F♭, so Gdim7 has the same notes as the diminished sevenths on B♭, D♭ and F♭. Any of its notes can be the root.