For over 60 years, a major choir competition has been held in Tanzania, organized by the Evangelical Lutheran Church and attended by more than 1,500 choirs from across the country. To be eligible to participate in this year's competition, choirs must perform the chorale "Verleih uns Frieden gnädiglich" (Grant us peace, graciously) composed by Martin Luther, as well as an original composition. In her documentary film "Sing It Loud - Luther's Heirs in Tanzania," director Julia Irene Peters accompanies six people from Tanzania who sing in three different choirs: Martha and Simon work as small farmers near the village of Monduli and sing in the Neema Choir. Maria and Evarest are married and run a car repair shop in the Tanzanian city of Arusha, and they also sing in the Cantate Choir. And then there are the two young people Kelvin and Nuru from the Kanaani Youth Choir.