The new teacher Messieur Mathieu brightens up the boarding institution for "difficult" boys, Fond de L'Étang ("Bottom of the Pond"), presided over by strict headmaster Mr Rachin. Mathieu assembles a choir, leading to the discovery of the childrens' musical talents and a transformation in the children.
"As it is in Heaven" is about (the fictional) successful and renowned international conductor Daniel Daréus, whose life aspiration is to create music that will open people's hearts. His own heart, however, is in bad shape. After suffering a heart attack he retires to the village in the far north of Sweden where he had endured a terrible childhood of bullying.
Soon the local reverend asks Daniel to work as the church choir's conductor, formed by all kinds of villagers, with all kinds of problems and fates. By and by, his music opens the hearts of the members of the choir, affecting their daily life. In the end, Daniel suffers another heart attack, but is completely fulfilled by reaching his life's goal.
BTW, in Sweden, choir singing and choir contests are some kind of national sports.