oh, interesting thread.
I have posted a few times asking how to teach music to dd1. she can pick up tunes by ear, but has not really made the conection to piano.
she can pick the odd tune out, and her school is helping her with this (by way of labelling the keys, and making her a score with just the letters on, rather than music notes)
we have had this book (and the Christmas one) for a while now. It doe shave a bit of a tinny sound, but if you keep the batteries charged, then it si ok.
the book part has: the music score (properly, notes on a stave), also each note is assigned a colour, so can play by following the colours.
the keyboard bit also lights up, so itis easy to follow where to go next.
I have tried and tried to find a reasonably priced keyboard with light up notes, but the only ones I have come up with are ££££
saintlydamemrsturnip had a post a couple of years ago about teaching music, I know she was looking into it for her ds (might have posted under a previous name though) - will try to search it out a bit later. it was a method used in the states, i think, specifically designed for children with learning disabilities