Yeah, whippoorwill stew would sound attractive. They're small, so you'd need several....

Another candidate would be sapsuckers. They purely _love_ to drum on hard surfaces, metal flashing and the like. One place we were camping, the little beast had found an outhouse vent that resonated perfectly. Sounded like a machine gun, at 4:00 AM. Then there was the one who liked the aluminum gutter of my mother's house, and had a similar performance schedule.