
https://www.ewtn.com/catholicism/library/general-introduction-to-the-lectionary-second-edition-2189c) The Acclamation Before the Reading of the Gospel
23. The Alleluia or, as the liturgical season requires, the verse before the Gospel is also a "rite or act standing by itself."41 It serves as the greeting of welcome of the assembled faithful to the Lord who is about to speak to them and as an expression of their faith through song. The Alleluia or the verse before the Gospel must be sung, and during it all stand. It is not to be sung only by the cantor who intones it or by the choir, but by the whole of the people together.
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