The best cover
Girls' Generation
Written by Evan Bogart
Kesha Sebert
Michael Busbee
Michael Linney
Length 3:06

"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.

Ke$ha's versionEdit

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".


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