YANBU - I've just moved from a flat where the neighbours were an utter nightmare.
I appreciate some families are musical, but their teenage son had a death metal band. He and his mates practised with two sets of drums, two electric guitars with amps and several sets of impressive shouty lungs. Windows open, several days a week, until late, and for hours on saturdays and sundays.
I finally had had enough (it wasn't possible to have a conversation in our flat it was so loud) and went and pointed out to them (very nicely and politely) that it was INSANE. They couldn't actually hear what I was saying at first, which was kind of...ironic.
The mother was all huffy and hysterical, and said 'well, would you rather HE WAS OUT IN THE STREET??'
I think even they then realised it was a bit ridiculous, as they seemed to stop him at 9pm most nights after that.
I now live in a great house, with brilliant neighbours who make a little bit of noise in a vaguely civilised manner. Low volume radio, TV, music, parties on saturday and sunday, little kids crying or playing: all fine, I have no problem with this, I'm not expecting silence.
I used to cry regularly, it was so upsetting and intrusive. I feel so sorry for whoever moves in to that flat.
To all of the posters who are defending the right for people to play music, please if you do anything, just briefly consider other people's rights too. You probably don't realise how loud it is to other people. They are probably too scared to complain; it took me about 6 months to work up the nerve. I don't think it's a great way to treat other people, to just expect them to lump it, or move house.