One folk song, four eras, completely transformed each time. Civilization VI's Australia DLC takes "Waltzing Matilda" and stretches it across the entire arc of human history. "The Ancient Era" starts with a lone vocal melody, raw and open like the outback itself.
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By "The Industrial Era" it's swelling with full strings and layered instrumentation. "The Atomic Era" goes cinematic and grand, the same tune now carrying the weight of a superpower. This is the Civ VI formula at its best.
One cultural theme evolving through arrangement rather than new composition. You hear the song grow up alongside your civilization. Four tracks that are really one long transformation. If you've ever declared war on Gandhi while an orchestra plays a bush ballad, you already know.