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

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