Sugary sweet and full of hooks, Girl's Day started before their own official debut with flash mobs staged in the entertainment and fashion districts of Seoul, which set the euphoric tone for the start of their careers. With utterly danceable singles, and a string of singles have been nominated for and won several of K-pop's top awards. It wasn't long until the public caught on to the girls themselves as style and TV icons too, and soon being in Girl's Day didn't just mean being in a musical group—it meant living a lifestyle. Explore this handpicked playlist to hear some of their best.