C# add13/A#
The C# add13 chord consists of the C# (Perfect unison), F (Major third), G# (Perfect fifth) and A# (Major thirteenth) notes, with A# as the bass note.

How to play the C# add13/A# chord
- Play A# as the lowest bass note in the left hand
- Find C# (Root) on the piano keyboard
- Add F (Major third) — 4 semitones above C#
- Add G# (Perfect fifth) — 7 semitones above C#
- Add A# (Major thirteenth) — 21 semitones above C#
- Press all 5 notes simultaneously to sound the C# add13/A# chord