Baek Ji Young is known to K-drama fans as the “OST Queen” for her emotional ballads on the soundtracks of several popular dramas, including Secret Garden and Iris. But she's not just a ballad singer: She got her start with upbeat tracks that introduced Latin dance rhythms and Spanish guitar riffs to K-pop, and her husky voice gives as much high drama to a dance-floor filler as it does to her slower songs.