Fade Music after a Battle

I'm looking to fade music after a battle.  Currently the music is set to loop until the battle if finished.  I have an object with an Event Sounds component on it.  There are two actions on the component.  This first actions starts the music when the object becomes active at the start of the battle.  The second fades the music to -90db when it becomes inactive at the end of the battle.  I have two questions: 1) Is the the best way to do this?  2) Because the music is set to loop, does it continue playing (at -90db) and therefore continue to take up audio memory/processing even though it is inaudible?