aw! those pore poifect pitch kids!

I think it was Derrin who mentioned the students with perfect pitch who
could hear only one voice at a time?
I didn't think that was so much a "perfect pitch person's problem", rather,
it's more likely a syndrome resulting from limited exposure to music that
has a separate melody and accompaniment.
When I taught theory, and this was grad students, the problem the p-pitchers
had was that they tended not to hear intervals as such, but heard the
specific notes. Before the first drill that first year I made the mistake of
asking if anyone had perfect pitch. Of course, silence.
Well mean-ol'-me! I started presenting intervals on tape. I'd record the
drill and make a copy onto another tape using a tape machine on whose
flywheel I wrapped enough layers of duct tape to change its speed by approx
a quartertone. You can imagine the rest. Suddenly there were two people who
totally blew the whole drill. Lotsa whining. I insisted that we p-pitchers
were not exempt from knowing the sound of the interval itself and that from
now on the pitches would fluctuate from one example to another. Those two
got better real fast.