Hi, We saw this bird pair from our backyard perched on a power line. I searched the Audubon Guide in detail - especially sparrows, but nothing seems to match. Location: SE Michigan. Date: Aug 14, 2021.
The male's underside is shown, as is the female's. The black band on the male's tail should be a distinctive feature. The third photo is the female backside. They were sitting next to each other for quite a while, and calling out with just two quick notes: high and low.
-Brian