[Harp-L] Which Key? Perfect Pitch

["Aongus Mac Cana" <amaccana@xxxxxxxxxx>]

Someone has remarked recently (perhaps a little sniffilly) "Your ear should
tell you if you are in the correct key"
Oh but it does! Especially if you are not. 
If you happened to be blessed by not knowing, you could just blast on
regardless, assaulting everyone else's ears bar your own. 
I came across a fairly competent fiddler once who had great bowing technique
and rhythm, but if he started a tune in G it was anybody's guess as to what
key he would end up in. This was always a great source of wonder and
amusement to his musical  companions of the night
On the subject of Perfect Pitch, there are a number of programmes/CDs on
offer which claim to "teach you how to acquire Perfect Pitch in the privacy
of your own home".
Have any listers experience of  these "courses"? Do they work or are they
just another "catch penny"?
Beannachtai
Aongus Mac Cana