Dial A Carol is a FREE service that my old dorm at the U of I does every year during their finals week. You call them and request a seasonal song and they have a CD player hooked up to the phone line and pump it straight into the phone. 24 HOURS A DAY THROUGH THE 14th of December!! They have just about every rare holiday song you know, plus several variants of the more common songs to choose from. You can also tell them your favorite artist and see if they have anything by that person - you'd be surprised, the collection is HUGE.
If you have a cell phone and call during your freebee time at night, it's totally free. And they LOVE getting out of state calls. Plus, if it's 3am and you're stuck on the last paragraph of your paper, call them just so you can hear a human voice and get through those last few lines!
217.332.1882 is the phone number. Have fun. I know it's crazy that this is free, but it really is. It's a dorm-bonding/campus service kind of thing.
Here are some of my personal favorites:
Funky Funky Christmas
Percy the Puny Pointsettia (I don't think they have this anymore Karen!)
Dominic the Donkey
Little Drummer Boy by David Bowie & Frank Sinatra
[thanks Megan for the reminder!]