I think it's overly simplistic to group people into those who have perfect pitch and those who don't. Of course, I don't know if the article makes this claim, but I think a lot of people tend to view perfect pitch as a binary ability -- either you have it or you don't. But speaking personally, I have "sort of" perfect pitch (imperfect pitch? semi-perfect pitch?), by which I mean that I can sing and/or recognize the pitch of certain notes from memory, but not any arbitrary note, not under all circumstances, and not instantaneously. If I'm not right on the money, I'm usually at least within a semitone or two. I can do it reliably enough that I'm convinced it's not just a fluke when I get it right, but on the other hand it's not at all "perfect." Moreover, the recognition happens too slowly to be practical in real time; usually it involves audiating part of a song that I know has certain notes, and using them as reference pitches. Perhaps if I dedicated more time to it I could get it more accurate or faster, and maybe even develop proper perfect pitch.<p>All that being said, while having true perfect pitch would probably open up new ways to appreciate and understand the music I'm listening to, I think that relative pitch is a far more useful skill -- nigh essential for many genres.