I don't want to hear songs about how sunshiny things are. I don't like songs that feel like radio candy... I like the ones that make you think, laugh or cry - they pull some kind of emotion out of you.
There is a strange sort of reasoning in Hollywood that musicals are less worthy of Academy consideration than dramas. It's a form of snobbism, the same sort that perpetuates the idea that drama is more deserving of Awards than comedy.