Sirius looked at Hermione to explain. She said to him, "Sirius, consider an analogy. Only a tiny fraction of the population has perfect pitch. Suppose I pointed out a man and said, "See that man there? He can sing exactly on key. He expects you and me to bow and scrape when we’re near him, and to treat him extra nicely, because he has perfect pitch.’ What would you think? You’d think, "That’s ridiculous.’ What if I then said, "But he deserves to be treated as special, because both his parents and all four of his grandparents also have perfect pitch’? You’d think, "What you’re saying now is more ridiculous.’ Well, that’s how I always felt at Hogwarts, dealing with Slytherins, and snobby Ravenclaws, and Percy Weasley—that I was surrounded by perfect-pitch people who demanded I treat them as special."