I also agree with some of the previous posts--Do not allow them to slow him down just because of his age. It is just like them telling you to slow down DS6 in math because of his age.
If your DS4 loves the piano and is good at it I say that you should find a private teacher that is willing to work with him and continue to teach as his pace. A pace that keeps him excited and interested. A good teacher will also take the time to work on the technique and theory while the child is continuing to learn new songs. We had a wonderful piano teacher for DS6 who knew he was GT and never once told him that he was too young for anything.
That being said, my DS6 was playing piano and recently quit. Not because it was moving too slow or too fast--he truly just did not want to practice since the songs and techniques were getting progressively harder. He was no longer able to play each piece perfectly after one or two tries. He actually had to work hard and practice. This was something that he was not willing to do at 6 years old and I feel this is more his personality and perfectionism.
He has actually told me from day 1 that his real desire is to play trumpet and agreed to learn piano since I told him he had to wait until he was 9 or 10 for a brass instrument. The piano was a compromise and although he was good at it he knew it was just a stepping stone to the trumpet. When and if he asks to learn trumpet in a few years I will be more than willingly to accomodate this request.
