What the hell is a group sound bath?

https://lemm.ee/post/3411194

What the hell is a group sound bath? - lemm.ee

I went to a dronemetal concert once. It was two hours of the loudest thing I ever experienced, like a column of noise washing over and through my body, vibrating my inner organs. One of the top things I ever experienced. I’d absolutely do it first thing in the morning.