For more than 60 years a large choir competition has been held in the African state of Tanzania by the Evangelical Lutheran Church, with more than 1500 choirs from all over the country participating. In order to be allowed to participate in the competition, the chorale "Verleih uns Frieden gnädiglich" (Grant us peace graciously) composed by Martin Luther must be performed this year, as well as an original composition. In her documentary "Sing It Loud", director Julia Irene Peters accompanies six people from Tanzania who sing in three of these 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 have a car repair shop in the Tanzanian city of Arusha and sing in the cantata choir on the side. And then there are the two young people Kelvin and Nuru from the Canaani Youth Choir.