Having spent several years learning to sing challenging vocal music in which one has to hold one's own part regardless of what else is going on, I thought it would be fun to try with my 7-year-old. I asked him if he could play the piece again while I played something completely unrelated and weird on the piano. Not only did he do it, afterward, he said, "That actually sounded pretty good! I really mean it!", meaning our odd, aleatoric composition was somehow pleasing to his particular musical ear.
I totally didn't expect that. (Sigh.) His uncles would be proud.