It’s a custom for rock to be LOUD, but I don’t know why country can’t be more civilized.
My wife and I went to a couple of Reba and George Straight concerts at the Special Events Center in Austin and the noise level was tolerable. A few weeks later, we went to a Garth Brooks concert and left after the first 30 minutes. The entire building was shaking. I had fingers in my ears and it still hurt.