Nehemiah 7:1

7:1 When the wall had been rebuilt and I had positioned the doors, and the gatekeepers, the singers, and the Levites had been appointed,

Nehemiah 12:29

12:29 and from Beth Gilgal and from the fields of Geba and Azmaveth, for the singers had built settlements for themselves around Jerusalem.

Nehemiah 12:45-46

12:45 They performed the service of their God and the service of purification, along with the singers and gatekeepers, according to the commandment of David and his son Solomon. 12:46 For long ago, in the days of David and Asaph, there had been directors for the singers and for the songs of praise and thanks to God.