The Bee Gees' trademark high harmonies fueled the sound of '70s chart hits like "Nights on Broadway" and "Jive Talkin'," not to mention the influential 1977 soundtrack to Saturday Night Fever. But the Brothers Gibb didn’t always employ an aggressive falsetto. In fact, it was an act of desperation. We hear the story from David N. Meyer, author new book The Bee Gees: The Biography. Plus: our listeners show off their best Bee Gees impressions.