Angels We Have Heard On High

We have started singing Christmas songs so that the kids, especially Chance, will know the words by Christmas.
We just started at the beginning of the Christmas songs in the book and went from there. The first song happened to be,"Angels We Have Heard On High." The kids really got into the drawn out G-L-O-R-I-A part.
Chance and I were sharing a book and as we sang the song a second time, I noticed that Chance's G-L-O-R-I-A'S were quite monotone. There was no going up and down inflection happening on Chance's side of the chair. So for our third time through the song, I showed him how the notes went up and then down as you sang G-L-O-R-I-A. Then I demonstrated how this was done. Chance looked at me quite intently, and then we started singing the song again. When we got to the G-L-O-R-I-A part, Chance looked at me and added more inflection, but not quite how the song goes. I don't think he is picking up on the subtle differences in tones. He made his voice go up and down because I told him that is the way the song goes, not necessarily because he was hearing the inflection. How intriguing. We'll have to keep working on this song and see if he seems pick up the subtleties as we go along. I do wonder how Chance hears music through the implants.