Check out the periodical cicada broods web page. It's really interesting. It shows the 12 active 17 year broods and the 4 active 13 year broods, and which cycle each is on. It includes which year each brood comes out, how many, and a map of where each cyclical brood pops up. The ones popping up this year are brood II (2).
Plus, the map for the much larger "great eastern brood" X (10) due again in 2021.
Now this is what I was thinking. Lots of different broods on different cycles. I hear these things every year in the
SE. We also have tree frogs yacking away each year too.