Turning 50 this month, Kraftwerk's single Radioactivity stands as a landmark recording that gradually evolved into the German electronic innovators’ most overtly political statement. From the quivering opening moments of Radioactivity – the crackle of a Geiger counter, swelling synthesizers, and sharp Morse code tapping out the title – it is clear that something transformative is unfolding. The centrepiece of Kraftwerk’s fifth studio album, Radio-Activity (1975), feels at once like a