I like Slient night
Little Drummer Boy
Frosty the Snowman
Santa Claus is coming to town
Jingle bells (DS is learning it & Santa Claus at preschool I think.. he keeps coming home singing them and getting them mixed up. "Jingle bells in the snow.. and Santa Claus is coming to tooowwnn!" So cute)

Um, for my silly Christmas songs, I like any Christmas song that is the Chipmunks' version.. And "The night Santa went crazy" by Weird Al :P (But I only listen to that when DS isn't around hehe)