Gdim 8-string guitar chord

How to play Gdim on 8-string guitar

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

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

What notes are in Gdim?

Gdim, G diminished, is G, B♭ and D♭: the root (G), the minor third (B♭) and the diminished fifth (D♭). Its formula is 1 ♭3 ♭5.

What is the difference between Gdim, Gm7♭5 and Gdim7?

Gdim is three notes, G, B♭ and D♭. Gm7♭5 adds the minor seventh, F; Gdim7 adds the diminished seventh, F♭, a half step lower.

Where does Gdim go?

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

Keys with Gdim

Gdim is the vii° chord in A♭ major and the ii° chord in F minor.