A leitmotif is a dominant recurring theme—something (such as a melody, an idea, or a phrase) repeated many times throughout a book, story, opera, etc.

// The overcoming of obstacles and a love of theater are the two leitmotifs of her autobiography.

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“[F. Scott] Fitzgerald considered his year and a half spent on The Vegetable a complete waste, but I disagree, for he followed it with a new novel written with all the economy and tight structure of a successful play—The Great Gatsby. Both The Vegetable and Gatsby shared the theme of the American Dream (first as a spoof for a comedy, finally as the leitmotif of a lyric novel). I don’t think there has ever been a more elusive, mysterious, intriguing character than Gatsby. He’s pure fiction—and pure Fitzgerald: the hopeful, romantic outsider looking in.” — Charles Scribner III, Scribners: Five Generations in Publishing, 2023

The English word leitmotif (or leitmotiv, as it is also spelled) comes from the German Leitmotiv, meaning “leading motive,” and is formed from the verb leiten (“to lead”) and the noun Motiv (“motive”). In its original sense, the word applies to opera music; it was first used by writers interpreting the works of composer Richard Wagner, who was famous for associating a melody with a character or important dramatic element. Leitmotif is still commonly used with reference to music and musical drama but it is now also used more broadly to refer to any recurring theme in the arts—“The Imperial March,” heard in the Star Wars film franchise whenever Darth Vader appears on screen, for example—or in everyday life.