The Fifty Shades Of Grey movie is just about two weeks away (released on February 13) — you'll know this whether you're planning to go and see the movie or not, thanks to the huge amount of Twitter buzz around it. Today, adding to the chatter, Aussie singer/Dance Moms fan, Sia, has just dropped a new track, Salted Wound, from the film's soundtrack.  She's in good company with the likes of Jessie Ware, The Weeknd, Ellie Goulding and Beyoncé contributing to the backing music, and no, before you ask, the audio-only release has no Shia LaBeouf interpretative dance situations to speak of. 

Everyone was talking about Sia's last song. Here's why.

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