A song can optionally have an intro that plays before the main loop.
To use one, give it the same name as the song loop and add  _intro  to its name.

For example:
	mySong.mp3			(loop)
	mySong_intro.mp3	(intro)

The music system automatically checks for the existance of an intro song.If it doesn't find one, it simply plays the loop.

These naming conventions apply to both filenames and linkage names.
(be sure to include the .mp3 extension in bost cases) 