Diminished 7th chords

A diminished seventh chord is a 4-note chord — the root plus a minor third, a diminished fifth and a diminished seventh above it. Its four notes sit a minor third apart in a fully symmetric stack.

It sounds restless and unsettled, a favourite for dramatic passing motion into almost any key. Below are the diminished 7th chords for all twelve keys, from C to B — pick any chart for its full set of voicings, the piano shape and how it's built.