Adele, Sam Smith and more entrust their powerful pipes to this innovative cord expert.

When Christina Perri's song "Jar of Hearts" debuted on Fox's So You Think You Can Dance? five years ago, she went from waitressing to landing a recording contract. "I was singing 15 times a day," says Perri. "And then I started losing my voice." She was a bundle of nerves when she first met Dr. Steven M. Zeitels, the Eugene B. Casey professor of laryngeal surgery at Harvard Medical School and director of Massachusetts General Hospital's Voice Center.

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