I started piano when I was 4 years old and had perfect pitch immediately. I remember thinking all through my early teens that since I was able to recognize every note as it went by, that I must be hearing everything. I remember one day in Boulanger's class, this must have been about 1955 or 1956, she stopped a student at one point and said, "What key are you in?" The student was perplexed and couldn't be sure. And she said, "What kind of a chord are you playing right here? Just what is that succession of chords that you just played?" The student replied, "Well, I just played a German VI followed by a I, VI, IV." She said, "You see, you do know what key you're in." Then I thought, hey, that's interesting. That fellow identified what key he was in not by knowing all the notes he heard, but by a chord progression. I suddenly realized, wait a minute, I'm hearing all the notes, but I'm not hearing the chord progressions.This is from a interview with Easley Blackwood ("easily" one of the greatest intellects ever to mess around with music) talking with Bruce Duffee at Classical Connect, a nifty music-related site filled with thousands of excerpts of recorded performances (you can use the site as a pot-luck browsing radio using a feature they call "serendipity" if you don't mind having a piece end suddenly and morph into a new one), interviews with composers and performers, and some interesting forums.