The man behind the music also explains why being an outsider helped his work with Stephen Schwartz and Jon M. Chu Ariana Grande in "Wicked" (Universal Pictures) “When you walk into a room and it’s pink – what does that sound like?” That was the question presented to composer John Powell, who is partly responsible for the music in Universal’s blockbuster adaptation of “Wicked.” You can watch a new featurette about his score below. Yes, he is wearing a T-shirt that says “My Dog Thinks I’m Cool.”