Uncharted Worlds (galaxy map music) from the Mass Effect soundtrack

Stickerbrush Symphony from Donkey Kong Country 2

Since you mentioned a video game track, I’ll say Epona’s Song from LoZ OoT

Erana’s Peace - Heroes Quest (Quest for Glory)

Porcelain - Moby

I don’t know those two songs, but when I think relaxing and ethereal, I think Banco de Gaia.