Rihanna and Sia first collaborated when Sia wrote Riri's smash hit "Diamonds". Here is a leaked demo of another song that Sia wrote for Rihanna, which was said to be produced by David Guetta until Sia denied it on Twitter.
This is an unfinished version that still contains mostly Sia's vocals although Rihanna has started to replace it with her vocals that you can hear throughout the song, most prominantly in the second verse.
The final version would have been only Rihanna, but the song was never finished and pop music trends have now moved away from this fist bumping EDM sound.
Once Rihanna decided not to release the song, it was sold to Wiz Khalifa who made it into a softer hip-hop pop sound. You can hear Wiz's version here: www.youtube.com/watch
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