"Holiday shopping can be exhausting. And stressful. But a new video making the rounds on YouTube shows a smiling, if somewhat surprised crowd of shoppers after Yo-Yo Ma begins to perform at a downtown Chicago mall on Tuesday night. The setting is the Shops at North Bridge, a glossy mall on Chicago's Magnificent Mile. At about 7:50 into this video of a pop-up concert by members of the Chicago Civic Orchestra, the cellist turns up and begins playing."
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