C Suspended 4th (Csus4)
1+4+5
Notes in C Suspended 4th
C (root)FG
Inversions
Same notes as C Suspended 4th, with a different chord tone as the lowest note. Useful for smoother movement between chords instead of jumping around the keyboard.
Root position
C in the bass
1st inversion
F in the bass
2nd inversion
G in the bass
C Suspended 4th is built from C, F and G.
The other suspension raises the missing third up to a perfect fourth, which sits a half step above where the third would normally be. That closeness creates real tension, and it's why a sus4 chord so often falls straight back down into the plain major or minor triad on the same root a beat later.