Sophoclese -- thanks for the link to MMario's thread, some of those catches look like fun!

Sue vG I -- know what you mean about the happy, surprising harmonies. I get that sometimes when I record a .wav file of myself singing a round, then I paste the file over itself to into the round. But that can't compare to the richer harmonies you get through the harmonics of *different* voices...

I really enjoy doing things that are impossible to do alone -- like singing rounds, and telling stories out loud. :-)