Hi Again;
I also realized you said you tried to play an MP3. RH 8.0 does not support mp3's "out of the box". You need a small patch to make it work. Get it here:
http://staff.xmms.org/priv/redhat8/
You can also read more about RH 8.0 and mp3 support here:
http://www.xmms.org/
Have fun;
Marty