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

That is rather my point - you DO have to have music for the Morris dance to be exempt.

Because the music is already an such integral part of the Morris performance - dancing without the music would not really be a defined performance of Morris - to enable it to be exempt, would it?

My point is that whatever the intention - using the word OR instead of AND - could make them two different but equally exempt performances.

Even though Morris without the music is a practical if not a legal nonsense.