Look up SV40. It's a monkey cancer vaccine that was put in polio vaccines for years and has caused much human cancer. Trouble with vaccines is they are very powerful and you are at the whim of the makers who still BTW put cheap mercury in them. I have seen excellent proof people have been damaged by vaccines.
The restaurant owner should get a lawyer to write them a sweet buzz-off letter.
If there's ever doubt about whether a local band really owns a copyright, the restaurant could have a policy of only allowing public domain music to be played. That should make it harder for the music industry to descend on them, and if they continued to harass, go after them with a lawyer and seek punitive damages.
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