I've always been led to believe that the only hymn required at Benediction was the Tantum ergo, and that the others (O salutaris Hostia, the Adoremus, etc.) could be substituted with some other item deemed to be suitable. However, this seems not to be the case as Liturgy Office England and Wales says 'other hymns are possible.'
If this is the case, from where did I get the impression that Tantum ergo MUST be sung?
The Rite of Eucharistic Worship Outside Mass lists, in addition to Tantum Ergo: Pange, lingua, gloriosi Sacris sollemniis Verbum supernum Jesu, Nostra Redemptio Aeterne Rex Altissime Lauda, Sion (full or shortened) Adoro Te Devote and Ubi Caritas. Also, there is a note referring readers to the Liturgy of the Hours for further chants.
'Cantus Selecti' only gives Tantum Ergo, in various settings, in the section 'Ante Benedictionem', which suggests that it was the only choice in 1957. The rubrics seem to imply that, but my Latin is not adequate to be sure.
That the "Tantum Ergo" would be the only required hymn at Benediction may come from the practice of "40 Hour Devotion" and contemporary all night Adoration. In these cases, the "O Salutaris Hostia" is sung immediately after the exposition. Then follows the period of Adoration. When that is over, then the priest returns to the Sanctuary and the "Tantum Ergo" is sung, with the V & R. After the actual Benediction, the Divine Praises are said or sung, and the "Adoremus" is usually said but can be sung. Then there can be a closing hymn and the priest and servers retire.
We always sing the Adoremus... I have never heard it said. Mostly the Divine praises are said in English (In England), but it is also not uncommon to hear them sung in Latin.
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