Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Radio-Activity is a 1975 concept album and fifth studio album by Kraftwerk. It was also released under the German name of Radio-Aktivität. Unlike Kraftwerk''s later albums, which featured language-specific lyrics, only the titles differ between the English and German editions. The album is bilingual, featuring lyrics in both languages. The hyphenated album title displays Kraftwerk''s typical deadpan humour, being a pun on the twin themes of the songs, half being about radioactivity and the other half about activity on the radio. More word plays are evident in the track listing: the cleverly titled "Ohm Sweet Ohm", and "Radio Stars", which as a title could refer to pop stars, but upon listening is revealed to be about quasars and pulsars.