Let There Be Rock There Be Rock" was filmed in July 1977 (see 1977 in music) in the Kirk Gallery church in Surry Hills, New South Wales and featured Bon Scott, Angus Young, Malcolm Young, Phil Rudd, and Cliff Williams, who replaced Mark Evans as the band's bassist shortly after the "Let There Be Rock" album was released. This marked one of Williams' first public appearances with AC/DC. Scott was dressed as a priest and the rest of the band as altar boys, with Angus Young wearing a halo prop on his head. Towards the end of the video it shows Angus and the
Angus Young he would begin using in 1977, was also used as a compressor and a booster in his signal to "fatten up" his tone. Ever since adding it to his rig, it was used on several albums in the studio for chosen rhythm guitar tracks and all lead guitar tracks. Beginning with "Rock or Bust", due to the discontinuation of the Schaffer system, Young began using a replica of the unit's preamp with a commercial wireless unit. Contrary to popular belief, Angus and Malcolm have both stated in guitar enthusiast magazine interviews that very little pre-gain, if any, is used on