All the priests present, regardless of the group to which they belonged, had consecrated themselves. And all the Levite musicians - Asaph, Heman, and Jeduthun, and the members of their clans - were wearing linen clothing. The Levites stood near the east side of the altar with cymbals and harps, and with them were 120 priests playing trumpets. The singers were accompanied in perfect harmony by trumpets, cymbals, and other instruments, as they praised the Lord singing: 1 "Praise the Lord, because he is good, And his love is eternal." As the priests were leaving the Temple, it was suddenly filled with a cloud shining with the dazzling light of the Lord's presence, and they could not continue the service of worship.
References for 2 Chronicles 5:11