There are some music tracks in games that just make me feel at ease when I hear them.
Aquatic Ambience (Donkey Kong Country):
Sparkle Land (Wario World):
Rito Village (The Legend of Zelda: Breath of The Wild):
Starlight Zone (Sonic the Hedgehog):
The Bath House/Sky's Hatchery (Shantae: Half-Genie Hero):
Those are just a few from me. What video game music relaxes you? :)