No Overflix. Sing! is a 2001 American short documentary film about the Los Angeles Children's Chorus, directed by Freida Lee Mock. How do squeaky-voiced 8 year olds become amazing singers? Sing! tells the story of how a community group, amid severe cutbacks in the arts, is able to develop a children's chorus that is one of the best in the country. It was nominated for an Academy Award for Best Documentary Short.