Ever heard of crotales? No? Well, members of the University of Tennessee at Chattanooga Percussion Ensemble know what they are. Crotales are small, disc-shaped cymbals, each tuned to a different note, and their origins may date back to ancient Greece, Rome and Egypt. During the Beat Hunger concert on Nov. 20 at UTC, three members of the Percussion Ensemble played the instruments for a piece titled “Shui.”