Chain Reaction
[Taeyeon/Seohyun] Action Chain reaction-action Chain reaction-action
[Taeyeon] Yasashiku sa reruto chotto, yasashiku naru no
[Jessica] Fuan'na me o sa reruto (sa reruto) fuan ni naru no
[Tiffany] Dandan You're Loving Me, dandan I'm Loving You
Rensa shite ku kanj? no rar?
[Sooyoung] Ichiga+Ichiga ga 2 ni naru kankei
Nanka ja manzoku dekinai dakara
[Yoona] T?shindai yori choppiri
?kina ai tewatashi de kakezan-ch?
[All] Baby Ding-Dong hirogaru Chain Reaction
Uketotta ai de Ch-Changing My Mind
Kara sashidashu ai de Ch-Changing Your Mind
[Jessica] Ai ga ai o yobu Chain Reaction
[Seohyun] Sunao na omoi o kiku to, sunao ni naru no
[Sunny] Kakehiki wa shinaide, zuru kashikoku natchau
[Taeyeon] Dandan You're Loving Me, dandan I'm Loving You
Eien no kanj? no rar?
[Yuri] Itsuka sekai mo kaete shimau wa
Anata no h?to janainara
[Hyoyeon] T?shindai yori choppiri
?kina ai r? shite kakezan-ch?
[All] Baby Ding-Dong hirogaru Chain Reaction
Uketotta ai de Ch-Changing My Mind
Kara sashidashu ai de Ch-Changing Your Mind
[Tiffany] Ai ga ai o yobu Chain Reaction
[Jessica] Oh~ oh Chain Reaction oh oh
[Sooyoung] Tebanasu y?ki no nai ([Sunny] Oh Baby)
[Yoona] Semai kokoro ni ([Sunny] Are You Ready?)
[Taeyeon] Shimaeru saizu no shiawase wa ch?sai
[Yuri] Hito kara hito e
[Tiffany] Love to iu nano Virus ga
[Seohyun] Densen shite All Over The World-
[Jessica] S? wa ra Hito kara hito kara hito kara hito e~
[All] Baby Ding-Dong hirogaru Chain Reaction
Uketotta ai de Ch-Changing My Mind
Kara sashidashu ai de Ch-Changing Your Mind
Ai ga ai o yobu Chain Reaction
[Taeyeon] Chain reaction, [Tiffany] yobu chain reaction
[Taeyeon] Chain reaction, [Tiffany] yobu chain reaction
[Taeyeon] Chain reaction, [Tiffany] yobu chain reaction
[Taeyeon] Chain reaction, [Tiffany] yobu chain reaction