Kim Hyo-Yeon's powerful, passionate voice has made for some of the most memorable trot songs of the ‘90s, the kind that have become modern standards and karaoke favorites. While the vibrato-laden pentatonic scale melodies she sings are classic, her best-known songs update the genre by finding the common ground between trot's two-step rhythm and techno's thumping beats, with whirling disco strings thrown in for good measure.