“Among the faithful, the schola cantorum or choir exercises its own liturgical function, its place being to take care that the parts proper to it, in keeping with the different genres of chant, are properly carried out and to foster the active participation of the faithful by means of the singing. What is said about the schola cantorum also applies, with due regard for the relevant norms, to other musicians, and especially the organist” (General Instruction of the Roman Missal, no. 103).