If you have neighbors who party quite a lot during the day and early evening hours one thing I found that works rather well is take out your lawnmower and tie the safety bar to the handle, turn it on and let it run as close to their house as you can set it. That pretty much gets the message across and if it don't wait to early in the morning, do the same thing while they are still sleeping. But usually no one like's a lawnmower for backup effects to their music.