How do i add Sounds/Voices to my Custom Story

[Quick]

You don't need a snt file for music only an .ogg file e.g. the music file

So, I just create an "music" folder in my "CustomStoryName" folder, and put the .ogg file in it?
But, how will the game know which track should be on for which level?
Do I rename the .ogg file with the same name as the map i want it to play in, or do I do something else?
Thanks on the fast reply on a little old thread.