Jennie Punter Filmmaker Chloé Robichaud would often listen to classical music in the background to help focus her writing process — a subliminal influence that led to the creation of the main character of “Days of Happiness,” which world premieres in Toronto Sept. 9. Her third feature follows gifted young conductor Emma (Sophie Desmarais) at a pivotal moment in her career as she tries to reset her relationship with her controlling father (who is also her manager) and strengthen a complicated new romantic relationship.