Ahh… I did not understand that it was your neighbour’s kid. You’re fucked then. There is nothing else for it. You’re going to have to get up to hijinks: dress up as a child, infiltrate the neighbours kid’s school, become the coolest most popular ‘kid’ there. Then using that social status with the other kids convince them to bully all trombone players. (Maybe some collateral here). Then, with any luck, the bullying from the neighbour’s kids peers causes the them to give up the hobby, winning you your peace and quiet back.

Or frame the child for murder? A little time in Juvie will sort the issue…