Music Sonic Reducers: Brass Against and Other Rock n’ Roll Behaviours Nov 17, 2021 Facebook Twitter Pinterest WhatsApp Sonic Reducers. 1 topic. 2 music nerds. 5 minutes. We talk about the now-infamous concert where Brass Against singer Sophia Uristra peed on a fan, debate whether it goes too far, and share some of our own urine-stained rock ’n’ roll experiences.