Welsh composer Paul Mealor, who scored the music for Prince William and Kate Middleton's royal wedding, has a new composition in the works. For it, he's seeking a rich and low singing voice — one capable of reaching the "low E" note. And as he's learning, reaching the low E is no easy feat. To find a singer up to the task, Mealor has had to embark on an international search. Robert Siegel catches up with Mealor to hear how his search is going. And he also talks with Guinness World Record holder Roger Menees, who generated the lowest known note produced by the human voice, about how one accesses the "low E," and what it sounds like.