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I had the same problem with the same kinds of awful neigjbors and neither the cops or property managers did a damn thing about it. The cops would show up an hour or two after the complaint and said "turn the music down" and the neighbors would just turn it back up 5 mins after they drove away. 
I don't even get why having music that loud can be any sort of appealing. It hurts. It makes it hard to hear each other. It lowers the sound quality of the songs. So why. WHY.
I guess we are, not necessarily bad guys, but the odd ones out by being bothered by this. Or everyone's been so horribly shaped by oppression they don't care how uncomfortable they are in their own home.
Was gonna disagree, but those people sound like assholes >

I live behind an amphitheater that has concerts all summer long and those concerts are not even as loud as these parties.