A classic Swedish song called "Mer Jul" (Translates as "More Christmas") by Adolphson & Falk
And some Mediaveal Baebes with Adam Lay I-bounden.
Loreena McKennitt with God rest ye merry gentlemen
Geoff Castellucci + American Sirens with Mele Kalikimaka
And some really old stuff.. Riu, Riu Chiu