I'd place the right to sing and make music slightly behind the right to breathe, and on the same level as the right to free speech, of which it is an example.
If someone running a cafe or a bar wants to say they don't want music or singing, more fool them, but they are within their rights. When a law says you have to have a licence to chat away to your friends in song or music, that is a law too far.
Who are you calling a Brit?