"iTunes has a large selection of Internet-based radio stations that you can listen to, but what if your favorite isn't on the list? No problem: As long as you know what the URL is for the radio station's MP3 streaming content, just add it yourself.

"Here's how:

While iTunes is running, choose Advanced > Open Stream.
Enter the URL for the Internet radio station's stream in the Open Stream window's URL field.
Click the OK button.

"iTunes automatically adds the radio station to your Library, so you can listen to it any time you like by Double-Clicking the station's name."