Radio-Activity (German title: Radio-Aktivität) is the fifth studio album by German electronic band Kraftwerk, released in October 1975. The band’s first entirely electronic album, it is a concept album organized around the themes of radioactive decay and radio communication.
The album was accompanied by a single release of the title track, which was successful in France. To cater to the band’s international audience, all releases of the album were bilingual, with lyrics in both English and German. Wikipedia.