Would list some Ori ones but I always do anyways. This one is too overlooked.

Noki Bay stage

Nah whatever I'm posting more.

This beauty from Biomutant which somehow didn't even make it to the soundtrack release (referring to the second song that plays at 2:47 in the video btw, in case the timestamp doesn't work):

Lowkey one of the best songs in the Splatoon series:

When I listen to this I just feel at home:

This masterpiece from Astral Chain isn't exactly relaxing in-context, but here I think it works:

The most underrated song from Breath of the Wild:

Think these are some good ones that don't get much attention. Could just post a couple dozen Hollow Knight or Ori songs, but I mean, people will do that already.

I think the Traverse Town theme in Kingdom Hearts 1 is super relaxing. Especially in the shop next to the fire in the chimney.

This music is relaxing. It gives me peace of mind

MGS fans will know this