Hi Guest,

It's so great you could be there to help your son navigate through his 'perfect pitch'.   I think the only reason that I didn't have trouble if it were only a semitone off is because often our piano at home would be out of tune....so I got used to it.

I think that if I had learned musical theory at an earlier age---intervals or some variation of Do Re Me or I-II-III, I would have been able to transpose much easier.   Perfect pitch really is a wonderful gift.......and your son and sister are so lucky to have it.   But it doesn't come without costs.   

So if your son could just transpose the first note in a piece, then think of the next ones in terms of 'intervals'........I wonder if he'd find that easier?