These are the singers, heads of fathers' [houses] of the Levites, [who lived] in the chambers [and were] free [from other service]; for they were employed in their work day and night.
Moreover Chizkiyahu the king and the princes commanded the Levites to sing praises to the LORD with the words of David, and of Asaf the seer. They sang praises with gladness, and they bowed their heads and worshiped.
and Mattanyah the son of Mikha, the son of Zavdi, the son of Asaf, who was the chief to begin the thanksgiving in prayer, and Bakbukyah, the second among his brothers; and `Avda the son of Shammua, the son of Galal, the son of Yedutun.