Parallel to the world of people is another bustling society – a world of rats. Some of their communication with each other is located in an ultrasound frequency range. 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. Based on her fieldwork and findings, she will create a new multichannel composition that will be installed under Nylandsbrua this fall.