Bagpipes cutting through fog and rain. Europa Universalis IV's Rule Britannia music pack leans hard into Scottish Highlands atmosphere, and it works. Piper, Lead Your Clansmen is the obvious standout. Bagpipes over military drums, building into something that makes you want to form Scotland and fight everyone south of the border.
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Alba takes it down a notch with something more reflective, like staring across a loch after a hard campaign. A Battle in the Highlands brings the two moods together. Only three tracks but they commit fully to the Celtic vibe without ever feeling like a caricature.
If you play Scotland in EU4 and do not have this playing, you are doing it wrong.