C add9/F
The C add9 chord consists of the C (Perfect unison), E (Major third), G (Perfect fifth) and D (Major ninth) notes, with F as the bass note.

How to play the C add9/F chord
- Play F as the lowest bass note in the left hand
- Find C (Root) on the piano keyboard
- Add E (Major third) — 4 semitones above C
- Add G (Perfect fifth) — 7 semitones above C
- Add D (Major ninth) — 14 semitones above C
- Press all 5 notes simultaneously to sound the C add9/F chord