Sia wrote it
Sia recorded a demo version
(Is this true? This would make sense...)
Sia gave it to Katy Perry
Katy Perry loved it but didn't want to record something for Guetta
Sia gave it to Mary J. Blige
Mary J. Blige loved it and recorded it
David Guetta and Sia hated Mary's version
David Guetta had Sia re-record it and released it as a single
Sia's version >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>