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Bar manager is the person responsible for the overall running of the bar. his duties includes the hiring, firing & scheduling of bar personnel, stock keeping, promotions, public relations, finance, and anything connected with the bar. he is also usually the licence holder for the bar.
bar waiter is solely responsible for taking orders and serving customers.
bar tender is the person responsible for creating making and delivering drinks from behind the bar. he sometimes also needs to socialise with customers.
the person who is responsible for the music is called the dj.