Diminished 7th Chords

In most sheet music books, Cdim or C° denotes a diminished seventh chord with root C.  Some modern jazz books and some music theory literature use  Cdim or C°  to denotes  diminished  chord, while Cdim7 or C°7 denotes a diminished seventh chord.

A diminished 7th chord is comprised of a diminished triad ( is a triad consisting of two minor thirds above the root) plus a double flattend 7th (same note as the 6th). It’s primary use is  to lead to the tonic, or root note of the song.

Here are a few ways to play a diminished 7th chord.

 

Fret123456789101112
ChordCC#/DbDD#/EbEFF#/GbGG#/AbAA#/BbB

 

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ChordBCC#/DbDD#/EbEFF#/GbGG#/AbAA#/Bb

 

Fret123456789101112
ChordF#/GbGG#/AbAA#/BbBCC#/DbDD#/EbEF