C9

Extended · C root

C9

A dominant 7th with an added 9th. Funky and full of energy.

0 st4 st7 st10 st14 st

Notes in C9

CRoot
E3rd
G5th
A#7th
D9th

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 C9, Cm, C7, or another quality — the hardest and most useful ear training skill.

Dominant 9th in All 12 Keys

C9C#9D♭9D9D#9E♭9E9F9F#9G♭9G9G#9A♭9A9A#9B♭9B9

Other Chords in C

CMajorCmMinorC°DiminishedC+AugmentedCsus2Sus2Csus4Sus4Cmaj7Major 7thCm7Minor 7thC7Dominant 7thCø7Half Diminished

Related Extended

Cmaj9Major 9thCm9Minor 9thC1111thC1313th

About the C9 Chord

The C9 chord is a dominant 9th chord built on C. It contains the notes C, E, G, A#, D — the root, third, fifth, seventh, and extensions.

A dominant 7th with an added 9th. Funky and full of energy. Practising the C9 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.