This is certainly not your peppy-shopping-mall Christmas music.
Don your finest 9th century clothing and settle in for some monophonic plainchant.
Personally, I find it rather soothing.
(link repaired)
Choir of the Vienna Hofburgkapelle - Gregorian Chants For Christmas
1 Introduction: Die Geburt 1:41
2 Recitative: Es Bagab 3:16
3 Intermedium I: Fuerchtet euch nich 3:11
4 Recitative: Und alsbald 0:19
5 Intermedium II: Ehre sei Gott 2:36
6 Recitative: Und da die Engel 0:18
7 Intermedium III: Lasset uns nun gehen 1:40
8 Recitative: Und sie kamen 3:07
9 Intermedium IV: Wi ist der neugeborn 2:14
10 Recitative: Da das der koenig Herodes 0:39
11 Intermedium V: Zu Bethlehem 2:40
12 Recitative: Da berief Herodes 0:33
13 Intermedium VI: Ziehet hin 2:14
14 Recitative: Als sie nun den Koenig 2:33
15 Intermedium VII: Stehe auf, Joseph 2:01
16 Recitative: Und er stund auf 3:36
17 Intermedium VIII: Stehe auf , Joseph 1:57
18 Recitative: Und er stund auf 2:12
19 Conclusion: Dank sagen 2:45
20 Introit for the 1st Sunday in Advent 3:53
21 Introit for the 4th Sunday in Advent 3:19
22 Communion for the 3rd Sunday in Advent 1:12
23 Intriot for the 3rd Sunday in Advent 4:37
24 Offertory for the 4th sunday in Advent 2:36
25 Hymn for Christmas Vespers 2:28
26 Intriot for the 3rd Christmas Mass 3:32
27 Alleluia of the 3rd Christmas Mass 3:03
28 Communion for the Feast of St. Stephen 1:18
29 Gradual for the Feast of the Holy Confessor 3:41
30 Offertory for the 2nd Sunday after Epiphany 4:01
31 Communion for the 2nd Sunday after Epiphany 1:50