A new Sia song she wrote for a "pop artist" has appeared online

A new song written and sung by Sia has appeared online.

'Beautiful People Say' was initially attrib­uted to David Guetta with Sia doing the singing bit, but according to the lady herself on Twitter, it was written and demoed for a "pop artist" and has nothing to do with the French knob twiddler.

"Beautiful people is not david guetta, and it was merely a demo I wrote for a pop artist," she explained. "It is now a waste of a day's work, as it's leaked!"

:(

From the clip below it sounds like someone played it in a club scenario.