Fishes and Sia: Do two things go better together? Apparently, that was Ellen DeGeneres’s thinking, because she got her good friend Sia (not Kanye, sigh) to cover the Nat King Cole standard “Unforgettable” for Finding Dory’s theme song. If you’ve forgotten all about poor Dory, she’s the most forgetful fish in all the sea — which makes this cover very on the nose. Or shall we say, fin. Just keep singing, singing, singing and watch Sia and a lot of black fabric debut her stunning cover on Ellen.