Original soundtrack to the 2016 animated motion picture starring Matthew McConaughey Reese Witherspoon Seth McFarlane Scarlett Johansson John C. Reilly and others. Unlike soundtracks from other feature film Sing feature classic songs performed by the film s main cast with a brand new song: Faith performed by Stevie Wonder and Ariana Grande. In Sing a koala named Buster Moon has one final chance to restore his theater to it s former glory by producing the world s greatest singing competition.