The soundtrack for the highly anticipated upcoming movie, 'Fifty Shades of Grey' just keeps getting better with each new release. Sia has just unveiled her contribution to the soundtrack with an emotional new ballad called 'Salted Wound.'

The track is super sultry, with breathy vocals from Sia that fit perfectly with the sexual undertones of the movie. Alright, maybe they're not undertones, per se, but actually the focal point of the movie and there's no subtlety at all, but whatever. The point is that we're currently obsessed with the soundtrack for 'Fifty Shade of Grey.' If you don't have any plans for Valentine's Day, and the movie is sold out in every theatre within a twelve mile radius or however far you're willing to travel to see it, you can at least hang out on YouTube and set up a playlist with these songs and it'll be pretty much the same thing.

'Salted Wound' comes days after The Weeknd released a highly NSFW video for his contribution, 'Earned It,' as well as Ellie Goulding's crazy romantic video for 'Love Me Like You Do.'

Listen to Sia's 'Salted Wound' above and let us know what you think!