for, etc
1 Chronicles 15:16
And David spake to the chief of the Levites to appoint their brethren to be the singers with instruments of musick, psalteries and harps and cymbals, sounding, by lifting up the voice with joy.
1 Chronicles 15:27
And David was clothed with a robe of fine linen, and all the Levites that bare the ark, and the singers, and Chenaniah the master of the song with the singers: David also had upon him an ephod of linen.
he instructed
1 Chronicles 25:7
So the number of them, with their brethren that were instructed in the songs of the LORD, even all that were cunning, was two hundred fourscore and eight.
1 Chronicles 25:8
And they cast lots, ward against ward, as well the small as the great, the teacher as the scholar.