Few can sell the drama at the core of piano ballads like Cantopop singer Jinny Ng. The Hong Konger landed a record contract after music executives overheard her out singing with friends. She gracefully moved from the karaoke box to the spotlight thanks to her smooth, elegant voice, which glides over keyboard and string arrangements. Ng works wonders in the spotlight, hitting high notes over sparse backing, as on “Swipe Tap Love.” But she also shines in a duet, playing off the voices of singers like Alfred Hui on songs like “Soulmates.”