Shoutcast is currently the most popular streaming audio system on the Internet. To listen to Shoutcast, Winamp is required, the latest version is recommended. Once you have the software installed, you will need to find an audio server (think of it as a radio station) that broadcasts the music. Shoutcast currently hosts over 2000 servers and certainly is the place to look for streaming audio on the Internet.
To broadcast streaming audio using Shoutcast technology, first you must download and install Shoutcast plug-in under Winamp's plug-in directory. Once you have the plug-in installed, configure it by doing the following: Start Winamp, and press CTRL+P to bring up the Winamp Preferences window, select the Shoutcast plug-in under the Plug-ins/DSP/Effect category and click on the configure button. Once you have the server configured, you should be all set.