LaPorsha Washington, center, at a rally for her daughter, Jazmine Barnes, in Houston on Saturday. A 20-year-old man has been charged with capital murder in the girl’s fatal shooting last month.

Every week, Hannah Brewer, Jazmine Huggins and Amelia Jenner spend almost half of their time at work – about 20 hours – listening to as much new music released in Australia and New Zealand as ...