G# 3/B
The G# 3 chord consists of the G# (Perfect unison) and C (Major third) notes, with B as the bass note.

How to play the G# 3/B chord
- Play B as the lowest bass note in the left hand
- Find G# (Root) on the piano keyboard
- Add C (Major third) — 4 semitones above G#
- Press all 3 notes simultaneously to sound the G# 3/B chord