Here's an old experimental, mathy, music piece I did with Hobert Europe back in like 2003. It's based on the cicada principle, although I didn't know there was a name for it at the time. It's 4 short guitar loops, each a different prime number of beats (or maybe it was measures). Because we used primes, it goes on for quite sometime without any repetition. The whole thing would naturally repeat after the last measure.