What about to insert a noise background? Something like:
- blowing wind
- steps on a crackling wood floor or some shutting doors (or something else that can be confused with an in-game sound effect)
- thunders in the distance (maybe not...)
- the sounds of a light saber fight (just kidding...

We could use the soundtrack even for the background effect.
The soundtrack could be:
-20/30 second background
-song with background
-some second of background
Repeating a track like this could be less boring than a repeating song.
The only problem is I don't know what is the best background for the age...
How about that?