Call me crazy, but when I go out to take care of the chickens, I sing to them. Really gets the Tom turkey going! They all really start cackling, and running around. Perhaps my screeching isn't pleasant to them, can you imagine that?!?!
They are still laying over 70 eggs a day in spite of temps in the single digits and below. They really get going over Jingle Bell Rock. Maybe it is the dancing.
My favorite Christmas song is and has always been O Holy Night sung slow and quietly like a lull-a-by.