Well duh...it IS a landscape modeler in it's essense...don't think there were 'singing hills' in the minds of the creators....just having a bit of fun here....tjohn summed it up nicely. In case you hadn't explored and found it yet Movie Maker lives in Program Files on your C drive and works very nicely for adding sound to animations.. ...

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again