'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 helped them not; for the lords of the Philistines upon advisement sent him away, saying, He will fall away to his master Saul to the jeopardy of our heads.

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: and David had upon him an ephod of linen.