So Cool (쏘쿨) 아티스트 씨스타 앨범명 SO COOL 발매 2011.08.09 So Cool (쏘쿨)_씨스타 (Sistar) Are you Ready? Sistar and Brave Sound! We’re No.1 The illest collaboration! Let's get it started!! I wanna rock! x3 Rock it like this (Hey!) rock it rock it like this (Sistar!) Rock it like this (Hey!) rock it rock it like this (Party time!) Rock it like this (Hey!) rock it rock it ..