Eyolf Østrem wrote a little Christmas ditty "800 years ago," he says. It's a Gregorian chant in Latin, but I think you may enjoy it more than you expect. Hear it performed at things twice, but be aware that the song is slightly different from the sheet music. Not so much that you can't plop your iPad near the piano and give it a try yourself -or even try to sing along! Oh, you don't have a tablet? Then use the printable .pdf file he offers. -via Metafilter