Red Hat didn't include mp3 support in their distros because of licensing issues. Simply install it yourself by hand. Easiest way, imo, would be to install MPlayer
from source and compile in all the codecs - that way,you get mp3 support and support for other audio files.
I use this
how-to. Although it is for a program called Acidrip
, there are very good install instructions for MPlayer.
[size=small]How-to written by Trickykid, Acidrip written by Acid_Kewpie[/size]