Kind of sounds like a dog with a speech impediment, doesn't it?
When I was a wee child sitting in Sunday School class and the teacher asked what hymn we should sing, I always asked for "Hark the Herald Angels Sing." If it wasn't December, my suggestion was ignored.
Stupid teachers anyway.
I found this version on YouTube and was reminded of my son and his a capella singing.
This carol was originally written by Charles Wesley, the founder of the Methodist church. It began as a rather solemn little ditty until Felix Mendelssohn got hold of it and perked it up.
It's been called the most theologically complete of the Christmas carols and is one of the four Great Anglican Hymns, which just means that, among a survey of church hymnals in 1885, it was one of four hymns common to every church.
Don't I just sound too erudite for words now?