Achtung! -- Kraut Rock

[byzantium]

The classic, early 70s, Ash Ra Tempel features long, spacey guitar improvisations, often on top of the trance-like, metronomic drumming/rythm, which is so characteristic of kraut. Like Amon Düül II but less heavy, sometimes even ambient/atmospherical.

I haven't heard "Wall of Sound"