I'm hardly an expert, just an appreciator, of their sounds. A friend, back home in Iowa in summer for unanticipated reasons, some years ago, said she missed the night sounds.
I hadn't thought before about how the chorus was specific.
But now I'm thinking about a garden blogger friend in Indiana mentioning on her Facebook feed about how loud the night sounds were recently, so maybe there's a rural aspect, or it's tree frogs, too.
Regardless, I'm glad to listen to the chorus tonight.