Sia's the most powerful person in the music industry you've never heard of.
Sia Furler is a rare breed in the world of celebrity, in that she doesn't want to be one. Not at all.
She's written songs for the likes of Rihanna, Celine Dion, Beyoncé, Christina Aguilera, Britney Spears and Jennifer Lopez, but she refuses to be seen on camera.
If you haven't already seen the video for her new single, Chandelier, you must. It's already had nearly 12 million views on YouTube.
This week, she performed the track on Ellen. As is her style, she sang with her back to the camera (even refusing to turn around when Ellen ran over to congratulate her) and let the dancer from her video, 11-year-old Maddie Ziegler, steal the limelight.
We don't say this lightly, but it was breathtaking
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