After giving fans a small teaser of her track 'Reaper', Sia now unveils the full song which is co-written and co-produced by Kanye West. You can surely hear bits of Kanye's touch in the song, as it harks back to the pre-'Yeezus' period'. Taken from her upcoming LP 'This Is Acting', out January 29th, if you pre-order the album, you can get an instant download of 'Reaper' along with four more tracks. Have a listen.