The London-based singer Dua Lipa has released just five singles, all within the last 12 months. She won't put out her debut album until February 2017. But the 21-year-old artist has already begun to take shape as a creative force with a sound she calls "dark pop," melding sparse hip-hop beats with an ear for melody and interpretation. She might be a natural-born pop star: When she'd released just two songs, the BBC picked her for its Sound of 2016 list.