With her clarion mezzo-soprano and girl-power lyrics, Natasha Bedingfield came to represent a certain streak of mid-2000s pop: feisty, determined and not afraid to let her hair down and have fun. Some of Bedingfield’s biggest songs find their power in her straightforward delivery, whether she’s making declarations of love or striking up rallying cries for young women taking their first steps toward adulthood. Later hits allow for a little more brooding to creep in, but Bedingfield’s voice—and appeal—remains unwavering.