STOP EVERYTHING. Sia has released a new single and it is, quite frankly, a bit of a masterpiece. The Greatest is the first song from her new album We Are Your Children and it is everything you ...

The ultimate pop collab – Sia, P!nk and producers Stargate = new smash Waterfall! Of course, this is far from the first time Sia has teamed up with another massive artist - here's all the proof ...