Unfortunately for the organisers, it appears that officials listened to the complaints of locals who said the events are not as silent as advertised, a concern aired by the Austrian city of Salzburg in 2014 . Florence Nicollier, head of the department responsible for issuing licences in Lausanne, told 20Minutes that "during silent discos, the noise caused by the clientele is not negligible." The problem, The Local says, is that participants can't help singing along to the music. The department's decision on singing partygoers is final, and can't be appealed.