Space plays and stops
- Notes and intervals
- F#m3Am3Cm3Eb
F# Diminished 7, written F#dim7, is built from F#, A, C and Eb: the root, minor 3rd, flat 5th and diminished 7th.
Its 3rd and 7th, A and Eb, 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, F#dim7 is the ♯i°7 of the Diminished Passing Turnaround in F and the ♯iv°7 of the Jazz Blues in C.