# cymbals

two thin, round metal plates that are hit together to make a loud sound. See 2 Chronicles 5:12.

# arranging them by the command of David, Gad, the king's seer, and Nathan, the prophet

"arranging the Levites as David, Gad, the king's seer, and Nathan, the prophet had commanded" 

# for the command was from Yahweh by means of his prophets

"for Yahweh had commanded this through his prophets"