A 7(#9)/F

The A 7(#9) chord consists of the A (Perfect unison), C# (Major third), E (Perfect fifth), G (Minor seventh) and C (Minor tenth) notes, with F as the bass note.

Piano keyboard showing the notes for a A 7(#9)/F chord

How to play the A 7(#9)/F chord

  1. Play F as the lowest bass note in the left hand
  2. Find A (Root) on the piano keyboard
  3. Add C# (Major third) — 4 semitones above A
  4. Add E (Perfect fifth) — 7 semitones above A
  5. Add G (Minor seventh) — 10 semitones above A
  6. Add C (Minor tenth) — 15 semitones above A
  7. Press all 6 notes simultaneously to sound the A 7(#9)/F chord