Ive said the same at a metal show lol.

Megadeath was performing and something went wrong to the tune of blowing all the speakers that actually put out sound (big "walls of sound" amplifier displays and the like are all theatre these days, it can be done better and cheaper with modern tech)

To MDs credit, they took half an hour with the roadies to get their personal equipment working through shit and rocked the rest if the show.