Sia- The Greatest (Piano cover) -by Richard Mak Nov 23, 2016 Cover, Cover emo, Cover sia, Rockin with my friends, Piano cover of Sia’s newest single, The Greatest. Subscribe for more piano covers! Like 0 Thanks! You've already liked this « MAK – Can’t buy me love – cover » TREY SONGZ – Ready to make luv OFFICIAL video cover by Aiden Royce