18. Modern sacred music may also be used in all liturgical ceremonies if it conforms to the dignity, solemnity, and sacredness of the service, and if there is a choir capable of rendering it artistically.
7. Modern sacred music is likewise sung in many voice-parts
21. c) But if for some reason a choir cannot sing one or another liturgical text according to the music printed in the liturgical books, the only permissible substitution is this: that it be sung either recto tono, i.e., on a straight tone, or set to one of the psalm tones.
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