In german language perfect pitch is called "absolute hearing" - that shows better the wrong legend about the perfect pitch. If something is absolute it has to be fixed forever, like the number pi=3,14159etc. or the speed of light. The tone A is changing constantly, in the times of Bach it was a half-tone lower. The orchestras are tuning higher and higher, nowadays up to 445hz. If there is no absolute A there is also no "absolute hearing".
Perfect pitch is special kind of memory - you can remember pitches (you heard before, mostly on piano) - that's all. It has nothing to do with musicality, to the contrary: a perfect pitch could prevent one from hearing musically, means to hear tones in relation towards each other, not only the information "pitch" of single tones.
A perfect pitch is of course very useful for e.g. conductors (recognizing quickly wrong notes) or singers (finding the right pitch) and if a real musicians has by random a perfect pitch, he is a lucky person.
But to judge somebody because of his perfect pitch (or better relative pitch) is really wrong and dangerous: the entrance examinations of music academies are showing the tendency to rise the grade of difficulty of the ear training examination which is leading to wrong selections of the students, especially in Korea. Almost exclusively students with perfect pitch can pass the examinations for composition - musically highly talented young students have no chance to get in the university - that's a tragedy. I hope that all this young musicians find nevertheless their way.
