Global superstar Sia says this musical, her directing debut, is “a love letter to everyone who has ever felt they didn’t have a voice.” Funnily enough, lots of marginalised people have used their voice to criticise Sia’s artistic vision. They’re saying, loudly and clearly, shove your love. The movie was shot back in 2017, which partly explains why it feels like such old hat. It revolves around an angelic, non-verbal autistic teen called Music...