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For most, a night at the theatre means people dancing around dressed as cats, an audience singing along to Abba's greatest hits, or Nathan Lane hamming it up But for Barry Levy, MD, a licensed internist and adjunct professor of public health at Tufts University School of Medicine in Massachusetts , a night of theater means something else entirely. For starters, he's usually performing rather than watching, and the material . . . well, the material is something Irving Berlin never would have imagined.