Quite a while back, my neighbor's adult daughter would play her stereo full blast each morning, with the bass turned way up, after her dad went to work. The walls of our house would vibrate with the "boom, boom, boom" of rap music. Annoying, particularly at 7 am. Of course, when cops came the house would be silent. So I bought an air horn. When she played the music, I would stand at my fence towards her open window 4 feet away and give a couple loud blasts of the air horn. After a couple times, she stopped the loud music. It also works pretty good on shutting up their pit bull when it barks, one blast through the fence boards.
Air horns are good non-lethal tools to have around.
I picked-up 5 refill cans of comp air at a local Ace Hardware today, since they were on sale from $24.90ea to 5 for $50.00!
http://safetycentral.com/airhoemalstr.html
Stored in a cool, dry basement with my SHTF supplies, the 4 extras will keep for many years, sealed.