The Expository Commentary:Psalms

More than one hundred psalms are prefixed inscriptions which give one or more particulars and directions for the public rendering of the sacred song, such as the name of the author, of the instrument on which the accompaniment was to be played, of the style of the music or of the poetry, of the melody which the choirmaster was to choose, of the subject or occasion for which it was written. The "chief musician" was the superintendent of the Temple music, who was probably at the same time the leader of the Temple orchestra and the director of the Temple chorus of priests and Levites.