If you can hear the difference in notes, even if its how high or low it is. A higher level of pitch perception can be developed. It just needs to be refined. You may not be able to obtain everything that they say Perfect pitch gives you (if you can’t sing, your not going to be able to perfectly sing a note of the top of your head.), but you can progress to a higher level by hearing. The only people who wouldn’t be able to are people who are tone deaf or completely deaf. Don’t worry, if you like music in any way, you ARE NOT tone deaf. People who are tone deaf can’t even hear the ascending and descending of pitches. The only thing keeping you from it is either the disbelief or lack of wanting it and working for it. It does take time to develop good pitch perception, just like it takes time to learn to play your instrument or sing. I know it is possible, just like it’s possible to get better at anything else, you can get better at hearing pitches. To contradict myself on this. Well hearing is a sense, and so is taste. You can’t learn to taste better, right? Sounds stupid, right? Well you wont learn to hear better either; your hearing will always be the same. Even if you took ear training for 20 years, you will never gain the hearing abilities of people like Mozart, Sinatra, and even people without “perfect pitch”, if you didn’t have it before. It’s not called Perfect Hearing; it’s called Perfect Pitch. Perfect Pitch is the understanding and absolute deepest perception of any given pitch. That is possible, you just got to listen, and take time to understand it.