The feature version of a short that first screened at the St. Louis Filmmakers Showcase in 2015, “Parallel Chords” chronicles the struggles of young violinist Jacqueline (Rachel Ann) to assert her individuality despite the intense pressure of her controlling pianist father (Bjorn Johnson) and the formidable weight of her own musical ability. Challenging stereotypes and accepted beliefs, “Parallel Chords” delves into issues of consent and control in a young, imaginative woman’s life rarely seen on film. St. Louisan Catherine Dudley-Rose — the film’s writer/director — is herself an accomplished violinist, and “Parallel Chords” draws on her own experiences as a musician, lending it a rare authenticity. The jury named the film as Best Narrative Feature at this year’s St. Louis Filmmakers Showcase.