A 9

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

Piano keyboard showing the notes for a A 9 chord

How to play the A 9 chord

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

Related slash chords