C Suspended 2nd (Csus2)
1+2+5
Notes in C Suspended 2nd
C (root)DG
Inversions
Same notes as C Suspended 2nd, 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
D in the bass (Csus2/D)
2nd inversion
G in the bass (Csus2/G)
Press C, D and G together on the keyboard and you're playing C Suspended 2nd.
Suspended chords pull the third out entirely, so they land somewhere between major and minor rather than picking a side. Sus2 fills the gap with a major second sitting close to the root, which gives it an open, slightly hollow color. It's a favorite way to add movement to a strummed or arpeggiated part without changing the underlying harmony.