This 1964 French film is a musical in the purest sense: every line of dialogue in sung, in what amounts to a jazz opera by composer Michel Legrand. Jacques Demy is the writer and director of this magical little movie, and its star, as luminous as possible, is Catherine Deneuve. She’s the star of the day on TCM, and her other films on view today and tonight include the much darker Repulsion (Roman Polanski’s 1965 descent-into-madness thriller, at 7:45 a.m. ET) and Belle de Jour (Luis Bunuel’s 1968 psychological study, with Deneuve as a repressed housewife who dabbles in prostitution).