Recorded by Jørgen Schou-Pedersen, Copenhagen 2002
Notes on the Alleluia Versus: Domine, refugium factus est:
The Alleluia follows immediately after the Graduale and precedes the reading of the Gospel. In liturgical performance the Versus, sung by a soloist(s), would (in this case) conclude with the whole choir repeating the long, textless melisma (the neuma or juiblus) at the end of the Alleluia. The Alleluia would then be repeated by the whole choir.
The Alleluia Versus Domine, refugium factus est is in Mode 7. It shows minor differences of detail from the authorized modern version of the Liber Usualis; in the 13th Century English Graduale Sarisburiense (facsimile ed., op.cit.) another Alleluia (with Versus Quoniam Deus magnus Dominus) is used for the 13th Sunday after Pentecost.