'Tago Mago' & 'Future Days'

Ugh. Any time the term "classical avant garde" or "ambient" are associated with your rock band then you've taken a wrong turn. Even if you're German.

Can is German and their music is obnoxious, far more than German "krautrock" groups that would follow. Although, there is evidence that the keyboard player would slam the keys with karate chops. So there is that.