It goes without saying, Deborah Cox knows a thing or two about powerful voices. She shared a stage with one of the greatest of all time.
Cher gave a nostalgia-inducing performance, and Celine Dion honored the 20th anniversary of ''Titanic'' with ''My Heart Will Go On.''
"I don't want you to worry," Celine Dion remembers telling her husband shortly before he died.
