G major/G#
The G major chord consists of the G (Perfect unison), B (Major third) and D (Perfect fifth) notes, with G# as the bass note.

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