Amarok is a popular software probable one of the most appreciated in the world due to its efficiency and inclusive package under Linux.
Amarok is however set as default standard under the OS Kubuntu. Amarok works also with Ubuntu which moreover limits to some packages. For more information, go to below link:
http://doc.ubuntu.org/amarok
The Gap with Amarok is that it does not read MP3 files when launched as default. To remedy to this, types in a console the following command:
sudo apt-get install libxine-extracodecs