Great Horned Owl

Last night at about 1 a.m. I heard a 4 note owl call, 14 times. At first it was very close, and it quickly sounded more and more distant, til I drifted off back to sleep. At least, I think it's a great horned owl, since that's what Camera Trap Codger thinks, and also I found Owl Pages has a clip of a "pair calling" which sounds pretty similar to what I heard (although what I heard didn't seem to be a pair). The Virginia Department of Game and Inland Fisheries has a web page describing the four types of owls found in Virginia.