With her clarion voice, Della Wu makes delicate Mandopop piano ballads forceful. The Chinese singer, active since 2003 primarily as a balladeer, brings a subtlety to her songs, starting numbers such as “Half” in a near whisper while soft keyboard notes play. Yet as the songs progress, her voice rises dynamically, adding intensity despite the spare accompaniment. Wu pulls off the same feat over swelling violin strings (“Onion”) and skeletal harp (“One in a Thousand”). Her skills have made her an in-demand singer for TV scores, where her vocal contrast mirrors the shows' twists and turns.