Sia stopped by Jimmy Kimmel Live! on Monday night, where she delivered a truly stunning performance of one of her latest hits, "Bird Set Free." Pairing her iconic, massive black-and-white wig [1] with a giant polka-dot bow, the famed singer-songwriter [2] belted out the haunting tune as a dancer freestyled all over the stage in a tan leotard made famous by her "Chandelier" and "Big Girls Don't Cry" videos [3]. Watch her powerful performance above, and then find out every surprising song Sia has written [4] over the years.