also check Kraan - Live 1975. This is a kraut-rock group whose live energy came to resemble uncomplicated progressive rock. Basically very riffy and very high tempo, but highly appealing. Also unique that they made their biggest impact (LP release-wise) displaying their musicianship in a live performance, and on a double album too. What you get is very worthwhile
http://www.youtube.com/watch?v=OME_5mFNJtQ