I didn't say perfect pitch was acquired ... it isn't ... you're born with it. I've never thought of it as being an extra "sense," but that may go a long way in explaining the phenomenom. I love the analogy to the F in the phone dial pitch. I'm going to try that. Like I said earlier, relative pitch has to be practiced. Regarding my theory professor ... he was a prodigy. Good thread, all ... moonchild