The proper Graduals are also responsorial in form.
That's from Ross Duffin's excellent book, A Performer's Guide to Medieval Music (Indiana UP, 2000).The gradual and alleluia ... have a function quite similar to that of the responsory of the Office, with the additional feature that the melismas of the alleluia are so extensive as to have their own internal melodic form. Thus the succession of gradual to alleluia creates a sense of climax, leading to the singing of the gospel, the high point of the liturgy of the word.
Also, does any official liturgical book give melodic formulas for singing the responsorial psalm? If not, then this is an incredibly large collection of texts that are meant for singing but that have no prescribed melodies in the official books. “Even” the lessons have the Prophecy/Epistle/Gospel tones....
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