33Those who were musicians, the heads of Levite families, stayed in the temple chambers and were exempt from other duties because they were on duty day and night.
34All these were heads of Levite families, chiefs according to their genealogies, and they lived in Jerusalem.
— 1 Chronicles 9:33-34

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"Well was it so ordered in the temple that the sacred chant never ceased: for evermore did the singers praise the Lord, whose mercy endureth for ever....."