I can stand children noise, conversation, laughter ... all the aspects of humanity out enjoying the sunshine in their gardens. That's all part of living amongst neighbours. Splashing in the paddling pool, screaming on the trampoline; OK, fine, we can put up with that. That's people; that's what people do. Fine by me.
What I hate, seriously hate, is people who inflict their own choice of music on their neighbours by playing radios loudly enough to be heard in next door's garden (or, in some cases, several gardens along).
I really enjoy music. I spend lots of time listening to music. Yesterday I was at a wonderful concert ... I listen to recorded music for hours every day. But I never impose my choice of music on my neighbours. Why? - Because they may not share my taste, and anyway may not wish to listen just now.
It is the height of selfishness and unthinking boorishness to impose your taste in music (or anything else, for that matter) on neighbours (or others - the same goes for those awful excuses for humans who play their music on trains etc.)
If you want to listen to music outdoors, use headphones. (Not expensive, easy enough.) Of course people who play their radios in their garden are not often interested in the music ... they just want a kind of noisy ambiance; perhaps because they lack ordinary conversational skills, or can't stand their own company? I dunno.
It's not up to me to block your music that I don't like with earplugs or headphones, either, as some pp have suggested. Ever thought I might want to listen to the birdsong you're blocking out with your inane choice of banal pop music? Don't I have the right to do that in my own garden?
No. Sorry about the rant. But, please, think of other people before you forcibly inflict your choice of music on them. Please!