Cool
. It won't matter if you are not using Gnome or KDE. Just as long as you have the QT and/or GTK libraries installed, you should be able to run any application. Chances are: you already have them installed ^_^.
If you have problems installing, please update your profile and tell us which distribution you are using. I ask this because depending of your distribution, you could install either of those applications with one command (eg. In Debian, it should be apt-get install amarok).
EDIT: silly of me to ask your distribution. I can now see this question is on DSL forum
. I believe DSL is build on Debian, so it should most likely be just a matter of apt-get <program name> amarok or rhythmbox I believe. Side note: Never used DSL myself