Space plays and stops
- Notes and intervals
- C#m3Em3Gm3Bb
C# Diminished 7, written C#dim7, is built from C#, E, G and Bb: the root, minor 3rd, flat 5th and diminished 7th.
Its 3rd and 7th, E and Bb, 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, C#dim7 is the ♯i°7 of the Diminished Passing Turnaround in C and the ♯iv°7 of the Jazz Blues in G.