Laura Erickson's For the Birds

This handsome, persistent singer breeds in the Southeast and winters in the Gulf States down into Mexico. It likes to stay out of sight in a tangle of vegetation, but patience can be rewarded, and his constant singing, even into the heat of day, at least gives you the sense that he’s somewhere in there.

I just happen to have seen and been first to identify the first one ever reported on a Wisconsin Christmas Bird Count, in Madison in 1979.