A sistrum (plural: sistra or (in Latin) sīstra;[1] from the Greek σεῖστρον seistron of the same meaning; literally "that which is being shaken", from σείειν seiein, "to shake"[2][3][4]) is a musical instrument of the percussion family, a form of rattle, used most notably by the ancient Egyptians.When shaken, the small rings or loops of thin metal on its movable crossbars produce a sound that can vary from a soft clank to a loud jangling.[17] Evidence of two bronze Minoan sistra suggests that they were created by separately molding the arch and handle, joining the two together with rivets later in the process.[clarification needed] The sistrum was occasionally revived in 19th century Western orchestral music, appearing most prominently in Act 1 of the opera Les Troyens (1856–1858) by the French composer Hector Berlioz.Classical composer Hans Werner Henze (1926–2012) calls for the flautist to play two sistra in his 1988 work Sonate für sechs Spieler (Sonata for six players).