If you have a Mac and you haven't downloaded iTunes yet, don't worry, there's still time. Go there now and get it. It also uses the Kerbango Tuning Service to tune the best MP3 streams on the net. An external program that will play the audio stream for you. After you install a player, your browser will know to open it when it encounters a playable stream.
All players are available in some form for free and are quite easy to install.
RealAudio Click the link above to get the RealAudio player. OR you can download the FREE RealPlayer 7 basic. Either player will work fine. The Real Player 7 just has a few extra features. Both versions play audio and video.