Your authority begins when you enter the court area. If the music is so loud, you cannot communicate with the table personnel or your partner (both of which comes under the requirements of your job) then you are within your purview to request it be turned down. If they don't comply, take the table personnel out in the hall and talk to them there. They'll get the hint. If they don't start Teeing them up.
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Yom HaShoah
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