If you are looking for Christmas or holiday music on the Internet, try the holiday music directory at Shoutcast.com.
There is a huge selection of stations that play everything from classic 1940's Christmas music tracks to the very latest releases by contemporary artists. And you can hear everything from country Christmas stations to Christmas jazz to classical Christmas music. You can sort the directory to reflect your connection speed.
The stations should open in your default media player when you click on them. If you are a Windows user who is looking for a media player I would recommend Winamp. Linux users might wish to try the Helix Player.