Banned songs would be an arbitrary decision by the proprietor of the radio or tv station but since this thread started, some songs would fall foul of UK legislation to prevent incitement of hate.

Back on Local decisions, I was a volunteer on hospital radio many years ago. We banned songs in bad taste, anything overtly political or the records aimed at maternity, such as Who's Sorry Now and Shotgun Wedding.

I'd have banned The Old Rugged Cross, but only because it was the most popular request and we were all word perfect!