Comparing to his other assignments, this piece is not that difficult on techniques. But after watching the video you referred, I found there is a big room for my son to improve on muscially expression. I will defintely ask him to watch that video, and maybe upload a new version of this piece in the near future.
This piece was given by his teacher as a treat after he finished a Beethoven Sonata. He hasn't done too much on Mozart. However, he has learned 9 inventions and 1 sinfornia from the two teachers. Now he is learning his second Prelude. He will be on the Prelude project for quite a while.
We are in Wisconsin, not a place that produces famous pianist.
Thank you for the link again!