Csus4 chord: suspended 4
Csus4 is the suspended 4 chord on C: C, F and G (1–4–5). Csus4 stacks the root C, the perfect fourth F and the perfect fifth G. In sus4 the third gives way to the fourth, creating a gentle tension that asks to resolve.
Notes in Csus4: C – F – GFormula: 1 – 4 – 5In the formula, the numbers count steps of the major scale starting from the note that names the chord; "b" lowers a half step, "#" raises one — and a slash names the bass note.
The F usually falls to E as it returns to the triad.
The same chord on all four instruments
Where to use it
Preparation and resolution to the triad; very common right before an important chord.
Part of the Suspended family.