Having previously teased snippets of the song, Sia has made the full version of 'Reaper' available online.
The track, taken from her forthcoming album 'This is Acting' - which is out on January 29th - features rapper Kanye West.
It's not the first time the pair have worked together, of course; they previously collaborated on West's song 'Wolves'.
Hear 'Reaper' below:
