Pure space opera orchestral scoring that has no business sounding this cinematic for a 4X strategy game. Paul Schuegraf composed Sins of a Solar Empire's soundtrack with a John Williams influence he doesn't even try to hide, and honestly it works.
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The Fallen Empire opens with these big brass swells and sweeping strings that make your fleet movements feel like actual galactic conquest. A World in Isolation drops the bombast for something more contemplative, lonely horns over sparse arrangement.
Then Relentless just builds and builds with this militaristic percussion that won't quit. The whole thing hits its target every time. If you've been staring at fleet compositions for hours and tuned out the music, pull up the soundtrack on its own and actually listen.