C# Suspended 2nd (C#sus2)
Also written as Db Suspended 2nd (Db and C# are the same key).
1+2+5
Notes in C# Suspended 2nd
C# (root)D#G#
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
2nd inversion
G# in the bass
C# Suspended 2nd consists of C#, D# and G#, played at the same time.
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.