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.
“Anybody can have a birthday. It requires nothing. Murderers have birthdays. It's the opposite of anything that I believe in. And I don't like at work where you stop everything to sing 'Happy Birthday' to someone. I feel like that's for children.”