Some people say Perfect pitch cannot be true because no two pitches are exactly the same. Yeah, this is true. No two pitches are exactly the same, but it is the same with everything else in nature. No two colors are exactly the same, the red of a stop sign if a different shade of red than a red light. If you make, say spaghetti one day and then make it a week later, it doesn’t taste the same. So Pitches are the same way. When you say a stop sign is red, well so is the red light. And if you sit down to eat, hopefully you know what spaghetti tastes like, and you don’t confuse it with macaroni and cheese. Pitches are the same in this aspect. Each note has its own sound, C, D, E, F, G, A, B (includes sharp and flat notes). Each note has its own range, like in Bach’s time an A was flatter than it is today, it was more like the Ab we hear today. But that still is a pitch, whether you called A or Ab or X. It’s doesn’t matter, it still has a certain sound to it. Perfect Pitch is hearing these differences in sound. Perfect Pitch is not saying C has to be exactly 440 vibrations per second; this is impossible to calculate with the human ear. Even when you tune your instrument, it is never exactly right. Even your dog couldn’t hear that your E is 15 vibrations to flat. You get a range for each pitch, that is what how you tell the difference between notes. Yeah, if a C is a little too sharp it starts to sound a little C#-ish. Perfect Pitch will help you recognize this.