Extended · C# root / D♭
C#9 / D♭9
A dominant 7th with an added 9th. Funky and full of energy.
Notes in C#9
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#9, C#m, C#7, or another quality — the hardest and most useful ear training skill.
Dominant 9th in All 12 Keys
Other Chords in C#
Related Extended
About the C#9 Chord
The C#9 chord is a dominant 9th chord built on C# (also written D♭9). It contains the notes Db, F, Ab, B, Eb — the root, third, fifth, seventh, and extensions.
A dominant 7th with an added 9th. Funky and full of energy. Practising the C#9 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.