Mass for the Shepherds by Pietro A. Yon
53. The Gloria in excelsis (Glory to God in the highest) is a most ancient and venerable hymn ... The text of this hymn may not be replaced by any other. ...
Though few people heed that. Some repetition of phrases is tolerated of course in many polyphonic settings, but not I think wholesale displacement as in repetition of a refrain.Huius hymni textus cum alio commutari nequit
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