It's stated in the built-in entity help that if you put two MP3 paths in a "music" key, the first one will play once as an intro and the second one will be looped afterwards. However when I do this, all it does is loop the intro file. This is the format I'm following:
 
 music - music/introfile.mp3 music/loopfile.mp3
 
 Can someone tell me what I'm doing wrong?