Loudest! Show! Ever! Motorhead, 1996. They played a bar setting with arena speakers. Don't know how they were allowed to do that, but that's rock & roll!!! Lemmy plugged into his stack and the hum alone vibrated the straw out of my drink. All I heard was WREEEEEEEEEEEEE!!!! in my ears for about seven days afterward.
Yes, Motörhead holds the Guiness Record for loudest rock show \w/
I never saw them live, though