did you get the mp3 plugin for XMMS? RH 9 didn't include mp3 support for some legal reason. You can get it here
. You will only need to get the plugin if you already have xmms.
Also make sure you have the volume turned up in the volume control... main menu > Sound and Audio > Volume Control. Make sure master is turned up and unmuted and the cd is also turned up.
<edit>I hate fast typers!</edit>