Watch Music (2021) HD Full Movie Free on SolarMovie. Watch Music (2021) online free. Zu is newly sober when she receives news that she is to become the sole guardian of her half-sister ...Zu is newly sober when she receives news that she is to become the sole guardian of her half-sister named Music, a young girl on the autism spectrum. The film explores two of Sia's favorite themes: finding your voice and creating family.