Tiny hijack...
Our apartment is great, with nice thick soundproof walls. The hall and front door, however, are another story. If you are in the living room you can hear everything in the hall/common area between the 4 apts just as if you were out there.
The neighbor's kids are girls in the 12-14 range. For awhile they and their friends would hang out in the hall/common area and talk, laugh, gossip, whatever. It started to happen later and later, like when we were trying to sit and read at night, or watch TV. I accidentally came up with the perfect solution...
One night I sat on the couch, unavoidably listening to a group of girls talking about boys, school, etc. When they started debating on whether or not one of the boys really did like the girl's hair like he said, I waited for a break and said, loudly, "Well, I think he really liked it- he said the braids were pretty and he thought the blue tips were good. Why don't you get a shirt that color and see what he says?"
There was a moment of silence and then hysterical giggles from the whole group, with some running and silly thumping. A few minutes later they were all in their apartment, still cracking up.
Oh, and regarding the original post, no one has a right to disturb the neighbors.