Space plays and stops
- Notes and intervals
- Gm3Bbm3Dbm3Fb
G Diminished 7, written Gdim7, is built from G, Bb, Db and Fb: the root, minor 3rd, flat 5th and diminished 7th.
Its 3rd and 7th, Bb and Fb, 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, Gdim7 is the ♯i°7 of the Diminished Passing Turnaround in Gb and the ♯iv°7 of the Jazz Blues in Db.