Play MP3 files with Amarok
Amarok is an complete audio software running on Linux.
It is usually installed by default if you use Kubuntu. It is also possible to use it under Ubuntu, with some packages:
http://www.linux-tutorial.info/modules.php?name=News&file=article&sid=4092
However, it does not read the mp3 files immediately, to deal with it, just a small package to install, type in the console:
sudo apt-get install libxine1-ffmpeg