I remember seeing Uriah Heep in an indoor venue in Buffalo years ago.
It was my first "big" show and I left because the sound was so terrible.
ELP in a stadium wasn't too bad, as far as I remember, but certainly not as loud as todays shows.
I saw ELP once and I remember it as the best concert I've ever seen. I didn't have the critical taste that I do now but I remember it as sounding incredible. But when I think back, it's amazing how with all the hi tech gear they were using that everything worked flawlessly. And how they had such a full sound with only 3 guys and no trax. Great arrangements. I miss you Keith.
Some of these modern bands could use that kind of musicianship in their act.