Good post, John.
Just to elaborate - there are different degrees of perfect pitch. Not sure how to explain it. There have also been studies conducted which seem to indicate that perfect pitch is partially genetic. anyhow, there are people with perfect pitch who simply hear the pitch of a note and recall it and can tell you what key something is in. There are others who will scream if when singing in a choir, the choir goes off into a quarter-tone soemthing -or-other and is not really in a key. (I'm not one of these thank goodness). There are others who can hear a huge chromatic-like cluster of notes and name them all on the spot without much thought. And there are some who can tell when a note is Ab and 3/4... very precise kind of pitch. So it does vary.
Fiona
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