Hands down, it is loudspeakers. They have them, big time, at the kindergarten on one side of me. The other side, which is the primary school, has them also. Both are very small schools with really NO NEED.
However the principal at the primary school enjoys making the morning announcements at 8AM on the loudspeaker. And the kindergarten uses it later in the morning, sometimes, to play music which the children sing to.
I prefer the singing children any day..........if I have to. The music is always a scratching sounding. The loud speakers cut in and out. Lordy, it is a teeth gritting experience. Kinda like someone running their fingernails down a blackboard.
Luckily it doesn't go on for hours and hours.
In addition, every time there is a group of musicians in the jardin, which is a ten minute walk, they crank up the loudspeakers. No need for me to be there. I can hear it just fine up here on the hill, softly.
And then there is the kid next door. A teenager. While washing his car, his speakers are so loud that my windows rattle. I just hold my breath and hope he hurries up and finishes. OR, that his parents come home and have him turn his music down. Sweet kid, always polite. It's just the music.
Thankfully, this doesn't happen often. Maybe that's why I notice it so much.