C 9

The C 9 chord consists of the C (Perfect unison), E (Major third), G (Perfect fifth), A# (Minor seventh) and D (Major ninth) notes.

Piano keyboard showing the notes for a C 9 chord

How to play the C 9 chord

  1. Find C (Root) on the piano keyboard
  2. Add E (Major third) — 4 semitones above C
  3. Add G (Perfect fifth) — 7 semitones above C
  4. Add A# (Minor seventh) — 10 semitones above C
  5. Add D (Major ninth) — 14 semitones above C
  6. Press all 5 notes simultaneously to sound the C 9 chord

Related slash chords