So...what would you expect to hear at 8:00 pm in the evening?
...
OK I've failed at attaching a sound file. So guess and we'll see how close you all are.
Shel
Edit - made a video instead, using a few photos I've taken in my back yard.

I live 30 minutes walk from the Sydney CBD, in an apartment complex of 6 buildings with over 500 people, nestled in between significant roads and under a flight path.
So...what would you expect to hear at 8:00 pm in the evening?
...
OK I've failed at attaching a sound file. So guess and we'll see how close you all are.
Shel