the moral is.........

well just an observation :

but make a legal distinction between amplified and acoustic.
And the number of performers made legally enforceable, just so we can get people watching football and singing at the tops of their drunken voices categorised as potential nuisance.

Not that any politician is ever going up against football, EVER.

There is a precedent on the acoustic front - the current PEL and music for Morris dancing.