Sia Kate Isobelle Furler, better know as Sia, is an Australian singer and songwriter. She is a popular artist in her own right, but has also written several songs for Kelly Clarkson. She helped pen Invincible and Let Your Tears Fall of the album Piece by Piece. Sia has also written songs for Britney Spears, Christina Aquilera, Rihanna and David Guetta.

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