That unmistakable early 2000s Key sound, piano and strings weaving together until you're emotionally compromised. Kanon on Windows basically invented the crying-at-your-computer genre. "Last regrets" is the opening theme and it still holds up, chorus version especially.
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"pure snows" captures that quiet winter sadness the game does so well, fragile and barely there. Then "Frozen Plateau" hits with something colder and more isolated. The whole soundtrack lives between hope and heartbreak, never picking a side for long.
2002 production means it has that slightly soft, warm digital sound that feels like a memory of a memory. If you've ever wondered why a whole generation of anime fans gets emotional about snow, start here.