Neighbour from "hell"
Show your kindness (compassion), with Buddhist wisdom ;)

... for ur particular case, buy ur neigbhour a set of headphone in supreme quality, with a note inserted e.g.: my favourite brand, cool stuff. Enjoy music any time, day &amp; night, dusk till dawn!

You may knock on the door to hand it to him, or send by mail. Remember, wrap it in nice gift paper, sign your name, with smile. Consider, the cost to move or cost of time to deal with engaging police/third party, this gift is tiny. 

And surely you will then hv a neighbour who will let u stayed in raining day when u forgot ur key waiting for the locksmith... 囧