Kraftwerk issued their single “Radioactivity” in 1975 and although it was played somewhat on the radio, it failed to chart within the Top 40 in the US; however, it was a number 1 release in France. The Morse code sequence spells R A D I O A C T I V I T Y. The vocal sounds come from the short-lived Vako Orchestron and the bass line is played on a Mini Moog synthesizer. Here’s the single mix of the tune.
The single “Radioactivity” is found on the LP “Radio-Activity” which is intended to have a double meaning – radioactivity and activity on the radio. The album version runs over seven minutes in length and features Geiger counter sounding effects in the intro.