have nothing in common with a 1950s music teacher". Barratier then began writing the script; Jugnot said that the first version somewhat "lacked roughness", and co-writer Philippe Lopes-Curval got involved. He collaborated with Barratier to strengthen the story and develop the psychology of characters such as Rachin—for whom the children are "the symbol of a failed professional life"—and Chabert. Casting The director was keen that the role of the young Pierre Morhange should be played by a real singer, and the search for him was tedious. While touring large French choirs to choose the one to record the film's soundtrack, they discovered the 12-year-old Jean-Baptiste Maunier of Les Petits Chanteurs de Saint-Marc: Barratier described his voice as "exceptional and very moving", and composer Bruno Coulais said it was "incredible". They decided to cast him as Morhange and use the choir for the soundtrack, but that the rest of the choir would not play his classmates because the director did not want them to be professional actors. Instead, they looked for children near the filming location in Auvergne: casting director Sylvie Brocheré visited primary and secondary schools in Clermont-Ferrand, looking for children between the ages of six and 15. After over 2000 auditions, the roles were cast. Of all the children, only the Parisians Théodule Carré Cassaigne and Thomas Blumenthal had some small acting experience. Filming Principal photography took place on location at the Château de Ravel in Puy-de-Dôme. Foam and salt were used as artificial snow and green leaves were removed from the grounds, since the beginning of the movie was filmed in the summer, but set in the winter. Fog machines were also used around the castle, and walls were deliberately scorched and stripped of paint to give the surroundings a "dilapidated" look, since boarding schools at the time often suffered from poor funding and management. When filming his first scene in which his character Mondain tries to intimidate Clément Mathieu, Gatignol had trouble behaving menacingly towards Jugnot, who described him as "too nice". For the scene in which Morhange drops ink on Mathieu's head, gouache was used. During choir scenes, song lyrics were written on large cue cards and the classroom's blackboard to aid actors. The children who played the choir described how their singing improved through the duration of the shoot; Nicolas Porte, the choirmaster of Les Petits Chanteurs de Saint-Marc, said that this "means that the