Here's a little thing I made up, derriving from Ootp, when Sirius was singing.(Goes along with the X- Mas song Comfort & Joy.)

God rest ye merry Hyppogriffs, let nothing you dismay, remember Harry your savior was born on that great day, to save all the Hyppogriffs from He-Who-Must-Not-Be-Named, Ooh tidings of comfort and joy, comfort and joy, Ooh tidings of comfort and joy.

Thats all I've got, hope you liked it.