C sus2/G#
The C sus2 chord consists of the C (Perfect unison), D (Major second) and G (Perfect fifth) notes, with G# as the bass note.

How to play the C sus2/G# chord
- Play G# as the lowest bass note in the left hand
- Find C (Root) on the piano keyboard
- Add D (Major second) — 2 semitones above C
- Add G (Perfect fifth) — 7 semitones above C
- Press all 4 notes simultaneously to sound the C sus2/G# chord