what up with FC4? he is running FC3...
but yes
$su
#yum install xmms-mp3
should do.. but if you cant install via yum - i coudnt first time used fedora (and linux) cuz yum needed a key i cant remember the name off (and no the "get-key" cmd didnt work) - you can find the rpm here:
hxxp://heidelberg.freshrpms.net/rpm.html?id=402 (dont forget to change xx to tt
and then - as root
#rpm -Uvh xmms-1.2.10-9.1.1.fc3.fr.src.rpm
and restart xmms..
also if you come from winblows, you might wanna play .wma files..
hxxp://heidelberg.freshrpms.net/rpm.html?id=1252
/niux