Released in 1975, Radio-Activity (Radio-Aktivitat) was the fifth studio album by Kraftwerk. This was the group's first entirely electronic album and a concept album dealing with the theme of radio communication.
The Man-Machine (German: Die Mensch-Maschine) is the seventh studio album by German electronic music band Kraftwerk. It was released on 19 May 1978 by Kling Klang in Germany and by Capitol Records elsewhere. A further refinement of their mechanical style,