The Barred Owl is another impressive owl commonly found (and more commonly, heard) around the farm. The Barred Owl's call is similar to the Great Horned Owl. I've read that the Great Horned tends to be about five hoots (Who who who whowho?) and, I don't know, more dignified? Resonant?
The Barred Owl's call, on the other hand, tends to be about eight hoots (Who cooks for you? who cooks for YOU-ou?). And I've heard it compared to more of a kazoo sound, to the Great Horned's oboe.
