Subject: Is there a limit to how loud a group of musicians can get?

For example, two flute players together make more sound than one. And three 
flute players make even more sound. 

But what about if there were thousands of flute players, or even millions 
playing at the same time in one city? Would the sound carry over to the next 
country? 

If everyone in China gathered in one place to play the same instrument, would 
we hear it over in the U.S.? Would they all go deaf from the loudness? 

I believe there is a limit past a certain point where the sound would reach a 
ceratin loudness and would get no louder. 

If that is true: using the flute example, do you know many flutes playing 
together it would take before reaching the point where additional flutes 
wouldn't add any more to loudness?  

Re: Is there a limit to how loud a group of musicians can get?