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

How to play the G aug/A# chord
- Play A# 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# (Minor sixth) — 8 semitones above G
- Press all 4 notes simultaneously to sound the G aug/A# chord