What is commercial?

From Daniel Kuney: "At the end of the day, I think producers, like Mr. Rudin, and artists, like Duncan Sheik and Lin-Manuel Miranda, achieve success by pursuing their own visions, and not by trying to conform to someone else’s idea of what makes a good movie or musical. For those of you who are sitting down at the piano for the first time or who are contemplating a career as a producer, I would encourage you to do the same."