D# 6/C#
The D# 6 chord consists of the D# (Perfect unison), G (Major third), A# (Perfect fifth) and C (Major sixth) notes, with C# as the bass note.

How to play the D# 6/C# chord
- Play C# as the lowest bass note in the left hand
- Find D# (Root) on the piano keyboard
- Add G (Major third) — 4 semitones above D#
- Add A# (Perfect fifth) — 7 semitones above D#
- Add C (Major sixth) — 9 semitones above D#
- Press all 5 notes simultaneously to sound the D# 6/C# chord