Now, Kim, I am careful. I said AUDIO equivalent, not MUSICAL equivalent, there's a difference. Look at the link, that Mike Biffle sent, BTW thanks! That will get you folks a hint of the idea. M C Escher uses THE SAME TECHNIQUE, basically, in all his paintings, but paints/draws different motifs all the time. And then, it was just a suggestion... "how about..." But definitely not a simple explanation for John Doe or Granny! In classical music notation it is called an OSTINATO pattern. Ravels Bolero being the most famous composition, /demonstration of how to use an OSTINATO pattern all the way through. Ravel was really a looper DJ... >be careful that you're not describing the style of music, rather than a kim >>How about the audio equivalent of an ESCHER painting?