As it says in the title, what was the loudest live guitar performance you experienced? For me, it was around 1982 an English (Yorkshire based) power trio in the NWOBHM genre called Vardis. Their frontman, a Johnny Winter lookalike called Steve Zodiac, played a blond Tele through Marshall equipment and in the normal dancehall-sized venue of the Sunderland Locarno/Meccacentre the noise was absolutely earsplitting. In hindsight I dont think he ever moved off the bridge pickup at full power. My mate and I were real volume enthusiasts but after ten minutes in front of what seemed like an ongoing explosion of sound we had to retreat from the arena back into the foyer where even there it was painful. My ears were still ringing two days later and it would not surprise me were I to learn that this gig gave me the tinnitus I now endure.