If you didn't get this puzzle, let me give you a couple of hints. First, sometimes the puzzle is about what's NOT there rather than what is. Second, the answer is from the music genre. So, looking at the picture, you will notice that of all the standard questions a person can ask, "Why?" is missing. Don't ask me why it's missing because I wont tell you. But if you still haven't figured it out,leave me a comment and I'll give you another clue.