[DNM] - Area-based Jukebox

A jukebox which alters the ambient sound in the current area and plays it with 100% probability.
Leaving the area stops the ambient sound.
Entering the area resumes playing the ambient sound, assuming you walked there yourself (for now).
Can someone explain to me why the ````world <<```` in StopPlaying() output anything here, or anywhere else where StopPlaying() is called?
It's weird because it worked when I began putting this together.