Happy 5th Anniversary, Sistar! Watch the K

BillboardHappy 5th Anniversary, Sistar! Watch the K-Pop Girl Group's 5 Best Music VideosBillboardHyolyn, Soyu, Dasom and Bora -- aka Sistar -- first debuted on the K-pop scene on June 3, 2010 with the release of their electronic/hip-hop track "Push Push" that came accompanied with a fun, but rather cheap, gas station-themed music video. Since then ...