A description of the program on the CBS News web site suggests that it will focus, at least in part, on Voigt's decision to undergo gastric-bypass surgery in June 2004 and the dramatic weight loss that followed. (The description also says that Voigt underwent the surgery because she was denied the chance to sing in a production at the Royal Opera due to her weight; in fact, the singer has said publicly on more than one occasion that she decided to have the surgery before that much-publicized incident.)

Voigt's upcoming roles include Leonora in Verdi's La forza del destino at the Metropolitan Opera. Performances begin February 20.

60 Minutes begins at 7 p.m. ET/PT. Check local listings.