Cdim7

C1E♭♭3G♭♭5B♭♭♭♭7

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

on ukulele on piano the scale

Every fingering that fits a hand

Fig. 2

x3424x

hard

Fig. 3

89a8a8

hard · barre

Fig. 4

8978xx

hard

Fig. 5

89a8ax

hard · barre

Fig. 6

xxabab

moderate · barre

What is true of it

Cdim7 is C, E♭, G♭ and B♭♭ — 1, b3, b5 and bb7 counted from C.

B♭♭ is a double flat, and it has to be: every letter from C upwards is used once, so the bb7 cannot be written any other way.

The easiest of the 5 fingerings below is x3424x: 4 fingers, held at the 2nd fret.

None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.

3 of the 5 need a barre.

2 strings stay silent.

Where its notes are on the neck

Fig. 7 — first 12 frets

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

With a different note underneath

first inversion

Cdim7/E♭

xx1212

second inversion

Cdim7/G♭

20121x

third inversion

Cdim7/B♭♭

x01212

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.

C in other shapes

C7dominant seventh Cmaj7major seventh Cm7minor seventh Cmajor Cmminor Cdimdiminished

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