Here's the first single from 'This Is Acting', the forthcoming album Sia's put together from all the songs she wrote for other people. 'Alive' was written for (and indeed with) Adele.
It'll be interesting, listening through the album, to divide the tracks into "so-and-so is an idiot, they should have recorded this" and "fair play, they were probably wise to give this one a swerve".