In the Liber Brevior's appendix (and in other Solesmes books), just after the Te Deum and under the heading "Invocation to the Holy Ghost" one can find the office hymn "Veni Creator Spiritus." But just before this will be found a mode 8 antiphon with this text:
On what occasions would this antiphon be chanted?
The text of the first half is the same as that of the 2nd alleluia for the mass of Pentecost.Veni Sancte Spiritus, reple tuorum corda fidelium, et tui amoris in eis ignem accende:
qui per diversitatem linguarum cunctarum, gentes in unitate fidei congregasti.
On what occasions would this antiphon be chanted?