Read about the experiment in this news article. The ‘experiment’ hasn’t started yet. I expect a lot of people at the Hermannstrasse station once the atonal music will resound in the station’s area. I also expect musicians and non-musicians get there with their instruments and or gear and play along with this music.
I will go there too and make recordings.
Some months later, the plan to use atonal music at the Hermannstraase station got abandoned.