"Chain Reaction" is a song performed by Girls' Generation. It serves as the thirteenth track on the repackaged CD+DVD edition of the album, The Best.
A demo recorded by Ke$ha leaked in 2009. The song was sold to Girls' Generation in 2013.
Ke$ha described the song as "beginning to see the universe as a cyclical chain of connected events after meeting a guy in a club" on her website, "KeshasParty".
- BMI | Repertoire
- HFA Song Code: CV79Q9