No. It means what it says. If it said "and" you would have to have music for the Morris dance to be exempt.

And No - subject to the Human Rights Act, tapping your feet to a morris tune is in no way similar to Morris dance.

Or am I missing an attempt at humour?

And yes, JOhn is illegal until the new law takes effect but the lnadlord carries the can back. S 134 as interpreted in accordance with the interpretation provisions set out his position after that.