Space plays and stops
- Notes and intervals
- Cm3Ebm3Gbm3Bbb
C Diminished 7, written Cdim7, is built from C, Eb, Gb and Bbb: the root, minor 3rd, flat 5th and diminished 7th.
Its 3rd and 7th, Eb and Bbb, 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, Cdim7 is the ♯iv°7 of the Jazz Blues in Gb.