Mark: I love rounds and have been, I can't quite say collecting, but at least accumulating them since childhood and trust me that is a long time. Do you have some great sources? I probably know over a hundred and you named a handful I do not know! Maybe we could swap?
One favorite is a 17th century risque one; trouble is, where does one sing a risque round? In my experience most round singing is done in the car on family trips or around Scout campfires....I did spend a memorable evening with a couple of friends one night in a Friendly's booth singing rounds for hours until they kicked us out at closing; some of the other customers and some of the help joined in.