For fans, one of the highlights of the Sex Pistols’ upcoming ‘Never Mind the Bollocks, Here’s the Sex Pistols’ box set is the “lost” 1977 studio demo of “Belsen Was a Gas” with John Lydon’s vocals, the controversial Holocaust-themed song billed as the only “original Sex Pistols composition of the era thought not to be recorded.”

Thirty-five years ago today, a nascent Siouxsie and the Banshees — with co-founders Siouxsie Sioux and Steven Severin joined by Sid Vicious on drums — played their first concert at the famed 100 Club Punk Special, opening for The Clash and the Sex Pistols. Hear it here.