C# add11
The C# add11 chord consists of the C# (Perfect unison), F (Major third), G# (Perfect fifth) and F# (Perfect eleventh) notes.

How to play the C# add11 chord
- Find C# (Root) on the piano keyboard
- Add F (Major third) — 4 semitones above C#
- Add G# (Perfect fifth) — 7 semitones above C#
- Add F# (Perfect eleventh) — 17 semitones above C#
- Press all 4 notes simultaneously to sound the C# add11 chord