Yugo Kanno turned a PS3 game about invisible children in the rain into something that sounds like a French lullaby dissolving in water. The rain OST is thirty tracks of quiet piano, sparse strings, and silence used as an instrument.
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"Raindrops, Footsteps" is basically the whole game's thesis in one title, delicate notes falling with the weight of actual weather. "Clair de Lune" appears because of course it does, Debussy was already writing music for this game a century early.
"Vanishing Shadows" shifts into something more anxious without ever raising its voice. The restraint here is everything. If you need something for 2AM when you can't sleep and the rain outside won't stop, this is the one.