I would say that the applicant who wrote the “Imagine” essay didn’t get due to the essay’s flat prose, poor organization, and questionable grammar, not its subject matter. The song was not sung “by the show,” but by the characters on the show. The sentence “When I watched this episode while the deaf adolescents were singing it, and soon joined by another glee club, it surprisingly affected me…” is just an incredible mess. He didn’t watch “while” they were singing; it should be “were joined by;” and “surprisingly affected me” is a terribly clumsy construction. How about: “As I watched another glee club join the deaf adolescents in singing the song during this episode, I was surprised by how much it affected me.” Not all applicants will be strong writers, but all need to show at least a basic grasp of how to communicate a thought.