- This song "One Day When We Were Young" comes from a 1930s American film called "The Great Waltz" that told the story of Johann Strauss II's life. - In the film, Strauss falls in love with a soprano singer who often sings this song when they are together. Though Strauss did not actually write this song, its beautiful melody and moving story in the film made a strong impression on audiences. - After the film was released, people mistakenly believed Strauss had written this love song for the singer. In reality, some parts of the story were fictionalized, including the origins of this song, which was adapted from Strauss's 1885 operetta using new lyrics