Set outside the main walkway from the apartments to the village is a perfectly garish flocked Christmas tree. It stands about seven feet tall and is adorned with bright lights and a rainbow of multicoloured birds. While ugly to look at, it looks perfectly docile. Until you try to walk by it. Whenever anyone approaches the tree, the birds are charmed to awaken and carry the tree directly in front of the person trying to pass it. And they sing! These carolling birds will be every so happy to sing you a lovely Christmas song... they also won't let you leave until they're finished. Every time you walk around the tree the birds will move it right into your path and start again.
Naturally, there are a few exception. For most of the villagers, they'll simply sing whatever song they like. For Severus, they'll sing only the 12 Days of Christmas in Chipmunk voices. For Lorcan, they'll simply whistle as he walks by. For Lily, they'll only sing her favourite Christmas songs, and apologize for interrupting her day if she says something along the lines of "not this again".
Songs your characters are likely to hear: Rocking Around The Christmas Tree, White Christmas, A Holly Jolly Christmas, The Christmas Song, & Jingle Bell Rock along with varieties of classic songs (like Jingle Bells, We Three Kings, God Rest Ye Merry Gentlemen, etc).