Finally understood what the sound I did hear on my way to work was: “Rats – Secret Soundscapes of the City”
A stone’s throw from the white-marbled Opera house, and based on the hypothesis that rats serenade one another with love songs, Jana Winderen will record the ultrasonic landscape of Bjørvika and slow the sound down to human hearing levels.
http://nymusikk.no/en/hva-skjer/jana-winderen-rats
