Sia premieres "Unforgettable" soundtrack for "Finding Dory"

- A song played during the end credits of "Finding Dory" has been revealed. Sia Furler performed the jazzy tune called "Unforgettable" during an episode of "The Ellen DeGeneres Show". She wore a dramatic black dress and her signature two-toned wig and giant bow, AceShowbiz said.

"Dory's story makes me teary," Sia said. "When Ellen asked me, I couldn't refuse!" The song was originally recorded by Nat King Cole in 1951. Natalie Cole later recorded it as a tribute to her late father in 1992 and it earned her a Grammy Award.

The movie is set six months after the original movie "Finding Nemo". Ellen DeGeneres and Albert Brooks are back as the voices of Dory and Nemo's father Marlin respectively. Diane Keaton, Eugene Levy, Ed O'Neill, Ty Burrell, Idris Elba, Dominic West, Bill Hader and Kate McKinnon join the voice cast as well. It's due the U.S. on June 17.