This singer/songwriter's albums yield a kaleidoscope of sunny pop and aching ballads. Since emerging at the turn of the century via an online singing competition, Sung Si Kyung has released a steady stream of albums that highlight his silky vocals and keen ear. These LPs house a wealth of material in their depths, tracing their creator's ability to evoke deep melancholy with a few simple notes or turn a sparse piano ballad into a joyful celebration.