Gdim7

G1B♭♭3D♭♭5F♭♭♭7

Three minor thirds stacked. The seventh is doubly diminished, which is why it is written with a double flat.

on guitar on piano the scale

Every fingering that fits a hand

Fig. 2

0101

open

Fig. 3

0464

easy

What is true of it

Gdim7 is G, B♭, D♭ and F♭ — 1, b3, b5 and bb7 counted from G.

The easiest of the 2 fingerings below is 0101: 2 fingers, held at the 1st fret.

1 of them use open strings, which is what makes a shape quiet to change to.

Where its notes are on the neck

Fig. 4 — first 12 frets

The brass dots are G, the root. Everything else is a chord tone with its degree printed in it.

With a different note underneath

first inversion

Gdim7/B♭

3434

second inversion

Gdim7/D♭

6767

third inversion

Gdim7/F♭

9a9a

An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.

G in other shapes

G7dominant seventh Gmaj7major seventh Gm7minor seventh Gmajor Gmminor Gdimdiminished

Cdim7 C♯dim7 D♭dim7 Ddim7 D♯dim7 E♭dim7 Edim7 Fdim7 all 374