Plague doctor soulslike and the music absolutely reeks of decay in the best way. Thymesia's soundtrack nails that oppressive, diseased atmosphere the game is going for. "Sea of Trees Exploration" has this creeping, fog-thick ambiance that makes just walking around feel dangerous.
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Then "Sea of Trees Combat" erupts into frantic strings and percussion the second something finds you. The boss themes go hard, especially "The Hanged Queen" with its unsettling vocal elements layered over aggressive orchestration.
"Sound of the Abyss" is just... dread. Pure, patient dread. The exploration-to-combat pairings for each area are a really smart structural choice. Soulslike fans who thought Bloodborne's soundtrack needed a more pestilent, feverish edge should absolutely check this out.