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In page Hazzan:

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Halakha (Jewish law) restricts the role of sh'liah tzibbur to adult Jews; in Orthodox Judaism, only males can lead public prayer before mixed-sex groups.[1] In theory, any layperson can be a sh'liah tzibbur; many synagogue-going Jews will serve in this role from time to time, especially on weekdays or on a yahrzeit. Proficiency in Hebrew pronunciation is preferred. In practice, in synagogues without an official hazzan (or in the temporary absence of one), those with the best voice and the greatest knowledge of the prayers typically assume the role.[citation needed]