Jan Smith is nothing short of a living legend. The vocal coach, based in Atlanta, has worked with some of the recording industry’s top talents. Big voices from Drake to Rob Thomas to Keyshia Cole to Monicaand, of course, Usherflock to Mama Jan to fine-tune their most precious instruments: their voices. A coach and vocal producer, Smith has more than two decades’ worth of experience in the music industry. Her latest project? Helping Justin Bieber as his voice matures. When considering whether she was up to the challenge, Justin wrote in his autobiography, I’m not worried. She got Usher through it, too.