There's no way the cops doing this on duty have that music licensed for non-personal use. Where are the RIAA lawyers when you need them?
(why people insist on playing music in public out of their phone speaker in an annoying way is another topic!)
States are immune from copyright infringement:
https://www.npr.org/2020/03/24/820381016/in-blackbeard-pirat...
Can someone explain why this is the case?
Also, federal copyright preemption only covers "equivalent" laws. So, for instance, state "true name and address" laws could still be used.
General incompetence and ignorance of the law have been used as justification for invoking qualified immunity. I'd be willing to bet there is almost no chance of successfully suing a police officer over something like this.