Therefore, laity of the male sex, whether boys, young men, or adults, when appointed by competent ecclesiastical authority to serve at the altar or to perform the sacred music, and when they fulfill this office in the manner, and form prescribed by the rubrics, exercise a liturgical ministry which is direct, though delegated. If they are singers, they must be a part of the choir or schola cantorum. (De musica sacra et sacra liturgia, 93c)
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