On the Seventh Day of iTunes...

"Mele Kalikimaka" by Bing Crosby and the Andrews Sisters. You may remember this one from National Lampoon's Christmas Vacation (a holiday tradtion for Carrie's family.) Recorded in 1950, you can find this one on Crosby's essential Christmas album, Merry Christmas, which according to Wikipedia, has been continually in-print longer than any other album in the history of the United States. Note: the CD version, for no apparent reason, is now titled White Christmas.