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Zapomniana melodia is a Polish musical comedy from 1938 directed by Konrad Tom and Jan Fethke, featuring three well-known songs by Ludwik Starski with music by Henryk Wars: Ach, jak przyjemnie! and Już nie zapomnisz mnie, along with an elaborate arrangement of the song Frère Jacques. The film's protagonists are the lovers, boarding school student Helenka Roliczówna and Stefan Frankiewicz. The young man sings the titular "forgotten melody", but when a series of misunderstandings arise between the couple, their feelings fade and they forget the lyrics of the song. However, they happily come to an understanding, Stefan remembers the song's lyrics, and the lovers live happily ever after. Helenka's father, Bogusław Rolicz – the president of a cosmetics company – uses the "forgotten melody" to remember the recipe for his invention and protect it from theft by a competitor in the industry, Roxy.