Artist-wise, I especially love Trans-Siberian Orchestra and Mannheim Steamroller, however my particular favorites that I've been listening to a lot lately:
Trans-Siberian Orchestra - Christmas Eve/Sarajevo
Mannheim Steamroller - Carol of the Bells
Mannheim Steamroller - Veni, Veni (O Come Emmanuel)
Mannheim Steamroller - Cantique de Noel
Amy Grant - Breath of Heaven
Amy Grant - Emmanuel, God With Us
David Lanz - O Come, O Come, Emmanuel
Song-wise: Carol of the Bells, O Come Emmanuel, Greensleeves, O Holy Night, We Three Kings...
You know, thinking about it... I seem to like all ones in minor keys, particularly the melancholy ones. Which seems to oppose the general spirit of the holiday. But, oh well. I think they're pretty :p
