I know I'm putting it up early but even this early is probably not soon enough to make it happen.
Would be nice if they could somehow incorporate festive clothes and decorations for the holidays, but such things are probably beyond HMX to implement.
Okay, so in no particular order:
The Waitresses "Christmas Wrapping"
Greg Lake "I Believe In Father Christmas"
Paul McCartney "Wonderful Christmas Time"
Paul McCartney "Pipes Of Peace"
Big Bad Voodoo Daddy "Mr. Heatmiser"
Billy Joel "She's Right On Time"
"Weird Al" Yankovic "Christmas At Ground Zero"
The Kinks "Father Christmas"
Adam Sandler "Hanukkah Song"