Have a look at the Music for Little Mozarts Curriculum.

It's what I teach in my studio, and I've had fantastic success with it! If your child has already learned the fixed do system, this curriculum would be a wonderful progression.

I haven't had a lot of experience with little musician, but does it teach them piano keys etc?

There should be a link to some more info on Music for Little Mozarts here: http://www.morganknowlesmusic.com/#!music-for-little-mozarts/c1ddc

It's also available on the alfred's website, try googling music for little mozarts?

Let me know what you think of this curriculum, I'd be interested to hear your thoughts. Especially from anyone with experience with the encore curriculum? I'm not sure which is better...

You make some really valid points in your post! And I thoroughly agree, the Yamaha method is brilliant, and children should be taught proper pitch from the beginning of their musical education. However, I think perhaps your claims about 'classical piano' may be a little too broad... The Yamaha method is a method of teaching classical piano in essence, I think perhaps the method you were taught (and most children are as well), which is very much alike to the english reading 'look and say' method is highly reflective of an era in early childhood education from which music education, and numeracy and literacy are all gradually emerging. What is important is not whether we learn a 'classical' or 'jazz' method, but that an actual understanding of the function and operation of music is well taught and understood. Understanding is the key in anything. Yamaha is to the so-called 'classical piano method' as phonics is to look and say in english literacy.

What really interests me though, is why in your opinion solfege has such merit over simply saying the english letter names or other musical syllable methods? Further, what benefits do you think fixed do has over moveable do? This is a very interesting debate which I am still undecided on and would love to hear your thoughts about!