C°7
Sevenths · C root
C°7
Maximum tension. Fully symmetric — every inversion sounds similar.
0 st3 st6 st9 st
Notes in C°7
CRoot
D#3rd
F#5th
A7th
C is the natural starting point — no sharps or flats. The clearest key to hear chord quality in isolation.
Identify the Chord Quality on C
Each chord below is played on C. Listen and identify whether you heard C°7, Cm, C7, or another quality — the hardest and most useful ear training skill.
Diminished 7th in All 12 Keys
Other Chords in C
Related Sevenths
About the C°7 Chord
The C°7 chord is a diminished 7th chord built on C. It contains the notes C, D#, F#, A — the root, third, fifth, and seventh.
Maximum tension. Fully symmetric — every inversion sounds similar. Practising the C°7 chord across different voicings and contexts builds the harmonic recognition that lets you identify it instantly in any musical setting — whether in a band mix, a recording, or a live performance.