'Master' in the Bible

Of Manasseh also there fell away some to David, when he came with the Philistines against Saul to battle; but they didn't help them; for the lords of the Philistines sent him away after consultation, saying, "He will fall away to his master Saul to the jeopardy of our heads."

David was clothed with a robe of fine linen, and all the Levites who bore the ark, and the singers, and Chenaniah the master of the song [with] the singers: and David had on him an ephod of linen.