Pandora is one of the best applications I have ever found on the Internet. I use it every day to provide with me with uninterrupted commercial-free music that is based on my personal preferences and it is 100 percent free.
I just learned of a trick to customize it for the holidays.
Here's the trick: Think of someone you'd like to hear some holiday cheer from, say, Bing Crosby. Tell Pandora you want to create a new station, but instead of just writing in the artist's name, type in "Bing Crosby (holiday)". Pandora will, then, pull in as much wassailing music from that particular artist (and others similar to him) as you can possibly stand.
Pandora