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The American Cheese Society will begin proctoring its next Certified Cheese Professional Exam in Des Moines, Iowa, on Wednesday, during the group's annual conference. The rigorous test is only in its fifth year, but nearly 600 people have passed it already. Industry experts say the exam is necessary because of the evolving standards in the growing American cheese business.

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AUDIE CORNISH, HOST:

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ROBERT SIEGEL, HOST:

You don't hear the word jingle much in advertising anymore, but there was a time when the jingle was king. Once ad agencies came up with their concepts or slogans, they needed music to make their sell.

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