Tangerine Dream in Bucharest, 1982.
So effing LOUD, when I opened my mouth and aimed it towards the speakers on stage I could feel the air in the bottom of my lungs vibrating, and you could also feel your jeans vibrating on your legs. The bass and low keyboard notes felt through the concrete floor, like artillery rounds landing. I went outside with some friends and you could FEEL the bass in the SIDEWALK through your SHOES.
TD was well known for playing the LOUDEST concerts in Eastern Europe. Basically, if they played in your town, you were AT the concert.
Then there was this one other concert of The Dixie Dregs, in Belchertown MA, at a joint called The Rusty Nail. The place was burned to the ground the next morning. SRSLY.