“For Judah rejoiced in the officiating priests and Levites. It was they who performed the liturgy of their God and the duties of purification – and the cantors and gatekeepers too – in accordance with the ordinances of David and his son, Solomon. For from ancient times, from the days of David and Asaph, there had been guilds of cantors and canticles of praise and thanksgiving to God” (Neh 12:44-46).