Every civilization gets four eras and each one actually evolves the instrumentation. The Civ 25th Anniversary soundtrack from Civilization VI takes folk melodies from real musical traditions and layers them up as you advance through history.
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America's ancient era is spare and acoustic, but by the atomic era it's this full orchestral swell. Arabia's progression is stunning, moving from traditional oud and percussion into rich modern arrangements. Brazil's tracks pull from real Brazilian folk music and build outward.
The concept alone is ambitious but the execution actually delivers across dozens of tracks. China's medieval-to-industrial shift hits particularly hard. If you've ever wondered why Civ VI's late game feels so epic, the music was scaling up right alongside your empire.