Every year about this time, we hear increased vocal activity between the adult Barred Owls that live in the woods behind our barn.  The male does alot of hooting and screeching with periodic responses from the female.  I never seem to have my audio recorder handy when they start.

A male Flicker is starting his territory  and courtship calls in the woods behind our barn as well - loud repeated "wick-er, wick-er, wick-er".