About twelve years ago my oldest daughter, who was almost 12 at the time, said that she could put her tape of CATS on in her room (she didn't own a Walkman yet) go out to the barn and do chores for horses, come back in "and be singing along with the tape". Of course I didn't believe it till I'd heard her do it, but she could. Then I said well then you have perfect pitch. No I don't, she said-- but when I asked her to sing the first note of Memories and she had it right, I said "remember that that note is C, and from there you can locate any note on the scale." And she could. Don't know where the ability comes from; I can generally name a note to within a half tone (if I am hearing a strange fiddle tune I can identify the key it's being played in more from the sound of the open strings and double stops than by pitch) but my oldest can still get things almost exactly. To answer Jon, she has it at least to within a quarter tone and maybe better.