Is Gregorian chant really intended for monks, or can it be sung by other men and women and children?
Whatever the impression given by some popular CD recordings, Gregorian chant is for everyone. It was originally sung by the whole Church, congregation and choir alike (back when congregations spoke Latin). It has always been sung by religious both male and female, and at least a bit of Latin chant has been sung by congregations throughout history. Medieval monasteries typically had boy choirs (we know less about girl choirs but they were also a part of women's religious houses), and all the chant at every liturgy was sung in octaves by monks and boys. This provides historical justification for having men and women sing together in octaves today. On the other hand, one might vary the sound between men and women together in octaves, men alone, and women alone, not just because of the challenge of getting octaves perfectly in tune, but also for pleasant variety.
These "other things" are all the other concerns that one must also take into account - the structure of the reformed liturgy, the importance of active participation, the value of vernacular languages, the cultural context of the worshiping community, the customs and traditions of that community, the musical abilities of the singers, the ability of the worshipers to unite themselves to Christ's paschal sacrifice by means of Gregorian Chant, and so forth.
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