Hector Elizondo

Sia’s last proper album, This is Acting, hit shelves more than four years ago. The pop superstar has been quite busy since then, though — and not just with her music. Not only is she working on the soundtrack to a movie she herself directed, she has also expanded her own family by adopting two 18-year-old boys. Marking Sia’s feature directorial debut, the forthcoming film is called Music. Co-written by Sia and children’s author Dallas Clayton, it’s based on a short story the singer penned in 2007. The story follows the life of an autistic teenager (Maddie Ziegler) who is cared for by her drug-dealing half-sister (Kate Hudson). If you’ll recall, actor and dancer Ziegler often appears in Sia’s music videos, including the now-classic clip for “Chandelier”, one of the best hits of the 201...