C# sus4
The C# sus4 chord consists of the C# (Perfect unison), F# (Perfect fourth) and G# (Perfect fifth) notes.

How to play the C# sus4 chord
- Find C# (Root) on the piano keyboard
- Add F# (Perfect fourth) — 5 semitones above C#
- Add G# (Perfect fifth) — 7 semitones above C#
- Press all 3 notes simultaneously to sound the C# sus4 chord