Sia Feat. Pusha T – Unstoppable! As everyone on the planet gets ready for the Olympics, worlds collide in the best way possible on Pusha T and Sia‘s new track. The president of G.O.O.D. Music and the illusive, face-covering Aussie crooner connect on the song “Unstoppable (Perfect Isn’t Pretty)” today (July 15) in promotion for the upcoming 2016 Olympic Games.