Dragonfly unreasonable? How ridiculous.
Sound is really magnified outside with the movement of air, and far more than if the noise was inside a building. It doesn't matter if it's a radio and someone listening to a cricket match, kids playing music or, heaven forbid, the local bore broadcasting to the nation in a deadly dull mobile phone conversation. Nobody has the right to inflict their 'noise' on others and even if they are not self-centred peasants, tone deaf builders or are simply hard of hearing, they are certainly not cool and essentially out of touch.
There is no excuse for anyone in today's world to inflict their 'musical choice' on others when it's easy and only sensible to listen to any personal choice - at any volume, location or time - through noise-cancelling headphones or ear buds.
Does anyone ever think what life would be like if, say, in a small area half a dozen other neighbours enjoying their own gardens did the same? Clearly people who make a hell of a noise in their own gardens have never given this a thought.
Some noise can't be controlled or is temporarily unavoidable, but people just creating a din and inflicting that on those 'just over the hedge?' Inexcusable.
What is it we're told? Noise is actually a form of violence.
Have a party and warn/invite your neighbours, celebrate some one-off occasion maybe, but for regular use and enjoyment of an outdoor space, try to think of neighbours really looking forward to dozing, reading, eating or just listening to the birds..........in their space and in peace!