An external class has been implemented in this project. This has to be imported by setting classpath. I have used eclipse to import the external class. 
The external class has been imported from the project JLayer. The "Player" class used from the project can be found online. 

SET THE CLASSPATH BEFORE RUNNING THE PROJECT.

The music files are to be placed in the mplayer folder.
The java files implemented is in the mplayer/src/mplayer folder.
Eclipse has been used to make this project.