This makes an interesting point - loud music in pubs is a hazard, since it forces people to shout, which spreads the virus. The same must go for all gatherings with high amplification.

Superspreader events

I found the recent accounts of spread in American meat packing plants interesting - they say it's because they're noisy and workers have to shout. When I worked in one of the biggest abattoirs in the world in the 1970s, NOBODY shouted - you walked up to people if you had something to say. The reason being that it was SO noisy that shouting was hopeless.