Operating mplayer in the linux console may be easy for beginners, but what about if you want to operate it from the GUI, such that double clicking a track plays it.
First of all, you need to have installed xterm for the below command to work.
Go to any media file that you would like to play, select, then on the "open with" tab, enter the following command:
xterm -e mplayer
That should now play your files in a command line terminal, which will be displayed, rather than hidden when use the mplayer command only.
Works in Gnome, KDE.
alternatively, you can download the Real Player for Linux, from their website. This is really easy to use and install.