MMario --

Yes, I can see (or should that be 'hear') how being able to hear the other people would make it a lot easier. A bit like winding the May pole in the dance: if you don't want the ribbons to get tangled, just make sure the one you're holding is up, when the person in front of you (and dancing in the same direction as you) is holding *her* ribbon up, and when the person coming toward you has his ribbon down...

In singing a round, just make sure you echo the person just to your side (left or right, depending on which direction the round is going)... right?