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The ''krotala'' (clappers)
They were of the most ancient percussion instruments, which were held in pairs and rhythmically crushed with the fingers (as the Spanish castanets), measuring the tempo and keeping the rhythm in choruses, weddings and festivals.
They consisted of two concave pieces of shell, wood, cane or metal loosely connected in their end with leather strips allowing an opening of up to 90 degrees.
In the middle, they had leather loops for a secure hold from the thumb and the middle finger of the executer, who usually danced simultaneously.
SOURCES: "M.L. West, Ancient Greek Music", "Solon Michailidis, Encyclopaedia of Ancient Greek Music", "Julius Pollux, Onomasticon".