Sevenths · C# root / D♭
C#ø7 / D♭ø7
Also called min7♭5. The ii° in minor key ii-V-I progressions.
Notes in C#ø7
C# / Db sits between C and D. A common key in jazz and pop — think Db major in many jazz standards.
Identify the Chord Quality on C#
Each chord below is played on C#. Listen and identify whether you heard C#ø7, C#m, C#7, or another quality — the hardest and most useful ear training skill.
Half Diminished in All 12 Keys
Other Chords in C#
Related Sevenths
About the C#ø7 Chord
The C#ø7 chord is a half diminished chord built on C# (also written D♭ø7). It contains the notes Db, E, G, B — the root, third, fifth, and seventh.
Also called min7♭5. The ii° in minor key ii-V-I progressions. Practising the C#ø7 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.