VIDEO: Sia Does Nat on Ellen

Sia appeared on Ellen DeGeneres's talk show on Friday, singing her version of Nat King Cole's "Unforgettable."

The iconic song -- famously covered by Cole's own daughter, Natalie -- is featured in Finding Dory, the forthcoming Pixar sequel to Finding Nemo that stars DeGeneres as a fish with nearly no short-term memory (get it?). DeGeneres told her audience that she asked Sia to sing "Unforgettable" for the film and was taken aback when the shy pop singer said yes.

The live performance felt a little underwhelming to some, with the music drowning out the song's beautiful lyrics and Sia's ever present wig covering up her face. Of the clip, Joe Jervis of JoeMyGod simply said this: "Awful." Rolling Stone disagreed, calling Sia's version "stunning." Judge for yourself.