Personally? Nothing. Music and noise never bothered me and I've lived through so many horrid situations that the typical stuff like that is minor to me.
I keep saying that the way we are forced to live is completely retarded, we shouldn't be living next to total strangers, not in apartments or neighborhoods. I've had lots of customers and almost all of them had major issues with their neighbors, many, many of them ending up in court, and always over silly shit like a foot of property or other issues that really just boil down to people not being meant to be packed in like we are. Currently, I have a customer who is being sued by a neighbor for a second time. With a species and a culture as territorial as ours it makes no sense to live 20 feet from a stranger. In his case, he's stressed and paranoid now and I'm just giggling at him. You know how slow that shit moves, it's a slow burn through court where everything is up in the air whilst these people who have more power than us (who don't really give a shit btw) dilly dally with our lives. If the manager don't give a shit, not much you can do except get a long running feud going with your neighbor.