Don't get on particularly well with our next door neighbours since they objected to a planning application we submitted a few years back. Since then we have tolerated each other, but don't go out of our way to speak to each other or socialise as we do with our other neighbours.
Next door, at the back of their house is a conservatory, and this is where their teenage son has his keyboard. The conservatory gives no sound proofing at all, so we can hear him playing his keyboard very clearly when we're in our garden. We can also hear it when we're inside our house with all the doors and windows shut. He plays the keyboard day and night (well, generally up until around 10.30pm, just in time to annoy me when I'm going to bed). It's much worse during the summer when we have our windows open.
We have tolerated this for several years, but it has now reached the point where I'm feeling increasingly stabby and anxious about it. The keyboard playing does not consist of what you'd recognise as music by the way, more like a cross between the theme tune to Dr Who and the sound made by a cat walking across a church organ. And it is loud, always.
AIBU to shove a note through their door politely asking them to keep the volume down, or even better, get some flipping headphones? I don't want to actually talk to them, so I'm going down the passive-aggressive note route....