What is the proper way to breathe when singing Gregorian Chant?
With operettic music and modern music, you only breathe in when there is either a breath mark or punctuation. Otherwise, in the middle of sentences, and especially in the middle of words, you're not supposed to breathe in.
How is it with Gregorian Chant? Take the Kyrie Eleison in the Missa de Angelis, for example. The e in Kyrie is very lengthy. When I hear Gregorian Chant, they do take breaths within the word, but I don't know if it's actually correct. With operettic and contemporary music it's improper to do that.