re my above post about servicemen singing- the armed forces are governed by military law- so presumably would be exempted from singing on military sites-[are they classed as public places? or 'any place'?]

But- what about the sort of sing-song orders shouted out by american drill sergeants for troops out marching? like in'full mental jacket'?
which have been adopted informally by our drill instructors.

and there's also concerts for people in jail- do gaols need a pel or are they exempt?

your thoughts please