It's an antiphon from Lauds of Easter during the Easter Vigil. Check the LU. It's also an alternate Communion antiphon for Easter Sunday in the GS.
Does anyone know how it came to be associated with Gospel Processions among the trying-to-be-solemn crowd?
when the alleluia from O Filii et Filiae isn't chosen
Isn’t it in the Graduale Simplex?
It is in each of GR, GS, and LU.
It was the alleluia given in the Jubilate Deo booklet
People use that as a Gospel acclamation?
it's not really Gregorian Chant in this application.
Otherwise, it would be accurate to call Rossini Propers "Gregorian Chant".
I know a place where we can go…
and hear the first four alleluias from the Mozart Exultate jubilate used as the Gospel Acclamation.
However, note that if you are using this mode 6 Alleluia as a Gospel Acclamation, it's not really Gregorian Chant in this application.
Nearby, one also finds the one that I hope I've attached to this post. I also hear it a lot.
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