Neema Bickersteth: What happens when a professional singer has a frog in her throat?

There’s a new production in Toronto that explores the very first musical instrument: the voice. “The Wolf in the Voice” features three singers, including the acclaimed Canadian soprano, dancer and performer Neema Bickersteth. She joins Tom Power to talk about the show, how it investigates the relationship between singing and the human voice, and the joy — and deep anxieties — faced by professional singers.