G add9
The G add9 chord consists of the G (Perfect unison), B (Major third), D (Perfect fifth) and A (Major ninth) notes.

How to play the G add9 chord
- Find G (Root) on the piano keyboard
- Add B (Major third) — 4 semitones above G
- Add D (Perfect fifth) — 7 semitones above G
- Add A (Major ninth) — 14 semitones above G
- Press all 4 notes simultaneously to sound the G add9 chord