Space plays and stops
- Notes and intervals
- Am3Cm3Ebm3Gb
A Diminished 7, written Adim7, is built from A, C, Eb and Gb: the root, minor 3rd, flat 5th and diminished 7th.
Its 3rd and 7th, C and Gb, are its guide tones: they say what kind of chord it is, so voicings are built around them and the root is often left to the bass.
In the progressions here, Adim7 is the ♯i°7 of the Diminished Passing Turnaround in Ab and the ♯iv°7 of the Jazz Blues in Eb.