What will Adele's voice sound like at the Grammys?

British sensation Adele knows that when she opens her mouth to sing at the Grammys this Sunday, just months after vocal cord surgery, many will be wondering if her voice will hold up. Hear what Adele herself had to say about those worries when she sat down with Anderson Cooper for an interview that airs on the "60 Minutes" broadcast this Sunday, Feb. 12 at 7 p.m. ET/PT.