Install ATI's Linux driver first. Most likely a package called xmms-mp3 which adds mp3 support to it. XMMS is very outdated anyhow, it uses the old GTK+ library which has been dropped from some distributions already, and hasn't been updated in years. I'd consider something else, such as AmaroK. It can be done by using an adapter that's supported in Linux There are about a million (± 999990) ways to install software in Linux. Most of the time when people brag how "easy" it is to install something in Linux, they type some seemingly random characters to command line (apt-get, yum, rpm, ...).