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Belle Linda Halpern is an accomplished cabaret singer who performs at least once a month. The rest of the time she coaches businesspeople on how to present more effectively. I'm the one bursting into song. Halpern, cofounder of the Cambridge-based Ariel Group, Inc., is an accomplished cabaret singer who still performs at least once a month. The rest of the time she coaches businesspeople on how to present more effectively by communicating more emotionally.