Plays the sound file "filename.ext", usually an mp3 file, as the current music file.
The music file should by default be located in the data files/music/ folder.
Stream music can also play MIDI files (JOG).
Note: Slightly bugged: Calling StreamMusic automatically sets the music volume to 100, and leaves it there even after the music has finished playing. Since there is no function to set the volume, the user has to reset to his desired volume manually through the options menu.
