First off is a song called Det Lyser i Stille Grender (meaning something like "light shining in silent places"). This is one of my absolute favorites at Christmas times!
And then comes Julekveldsvisa (the Christmas Eve song). It's written by a writer/songwriter who's very known for his tales and songs for children (you might've heard about Mrs Pepperpot?).
Let's see.. Luciasangen (the song for St. Lucia) is also a very pretty one. I'm not quite sure if I prefer it in swedish or norwegian, though - both are beautiful! (But they definetly celebrate St Lucia's day the best in Sweden!)
Let's see.. hmm.. Deilig er Jorden (earth is good?) is also a very pretty song.
I'll leave you with another one of my English favourites, one that I (embarrasingly enough) forgot all about when posting my other favourite English Christmas songs. Who's not heard Jiminy Cricket sing When You Wish Upon a Star? It's just not Christmas without it..