KISS New Music: Sia ‘Salted Wound’ From “Fifty Shades of Grey” Soundtrack [VIDEO]
In a word: no.
Now, that doesn't mean its a bad song. But its not a big hit like Ellie's is shaping up to be. In fact, Sia's song is so slow (there are a lot of 'ooohs' in it) that I bet this will be the song that plays over the end credits and not actually in the movie itself.
But I could be totally wrong. (I'm not though.)