I recently started taking singing lessons and actually learned that I possess this trait. My instructor realized this when I first started working with him and whenever I would miss a note, I reacted the way I always have: by vocalizing the hideousness of the sound. I’ve always done this. No matter what the instrument, I can always tell if a note is on pitch or even just slightly off. My instructor says it’s a gift while I think of it more as a curse because of the AWFUL feeling I get when I or anyone misses a pitch. Unfortunately, with this ability of identification doesn’t necessarily come the ability to always produce it. This makes for an infuriating process of learning any new instrument. It’s also infuriating to hear some people who make millions in the music industry when they cannot hit pitch without technological correction.