I watched it and saw these two guys don't have blue eyes...

Actually it should be public knowledge by now even in the US that the organizer of a musical event is responsible for licensing. Get informed, public. Not knowing the law doesn't leave you not guilty if there is an infringement.

That should be known especially if you have a venue that has music played for public.

It is not in the responsibility of the musician! I only know of one exception. In the US square dance callers have to buy a license to play their music and the square dancing clubs are off the hook. These ASCAP and BMI licenses are sold with the membership dues of Callerlab and American Callers Association.

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