Earth is almost entirely instrumental and difficult to describe, though I’ve heard them called doom metal and that doesn’t fit at all. Ultra slow ultra sparse, mostly just tone, feedback, and basic rhythm. But oh what tone. Start with The Bees Made Honey in the Lion’s skull

Mogwai is mostly instrumental post-rock, absolutely fantastic. Start with Mr Beast.

Brian Eno and his various collaborations, mostly atmospheric and always beautiful. Start with Apollo.