Cicadas! I remember them from my time in Cincinnati. I recall they can be VERY loud. The local pizza chain, "Snappy Tomato Pizza," used to put out a joke ad about "Snappy Cicada Pizza" every 7 or 13 years when they came out.
I think you're referring to what we call a July fly. It is a cicada that comes out every year. Not as many as when the 13 or 17 year ones come out. The 13 and 17 make noise all summer, in such numbers that you can't miss seeing them. They can devastate crops in a bad year.
We call them jar flies, and they sure do make a racket. Have not seen any so far this year. They lay their eggs on twigs which fall to the ground, nymphs live in the ground and eat on tree roots until the craw out of the ground up on trees and then molt.
The only problems they cause is damage to young trees by eating away at their roots.