What a noise!!
The typically sound off the summer is the singing off thousands Cicada's, a incredible insect.
From June until September they are all around.
The male Cicade is singing from the sunrise until the sun sets down.
Some times the noise can be very disturbing, so loud that it's pain your ears, but also it create this special summer feeling!
https://en.wikipedia.org/wiki/Cicada
https://nl.wikipedia.org/wiki/Cicaden