Just curious: In how many parishes are these hymns still used? Have people even heard of them?
Panis Angelicus (Bread of Angels), Adore te Devote (Humbly I adore thee), O Salutaris hostia (O saving victim), Pange Lingua Corperis (Now, my tongue, the mystery telling), Tantum Ergo Sacramentum (Come Adore)
Same; We use them throughout the year at Benediction.
Panis Angelicus is inscribed around the ceiling of our church, but I can’t recall singing it much. I’ve never heard of “Pange Lingua Corperis”? But I know Pange Lingua Gloriosi – Is that what you meant?
They’re all used at parishes that have Latin Mass (including cathedrals).
At parishes that primarily have OF:
Pange Lingua is popular for events such as 40 Hours Devotion services (a local church just used it for a 40 Hours procession last week). It is more typically sung by a choir than by the congregation.
Tantum Ergo and O Salutaris Hostia are the standard “benediction” hymns and one or the other, in Latin or in English as the priest chooses, is generally used at any Benediction, which typically takes place at the end of regularly scheduled Adoration. They also both make an appearance sometimes, usually in English, as Mass hymns at various churches.
For that matter, most of the hymns on IanM’s list aren’t forgotten either.
All the Marian hymns on that list tend to make an appearance on Marian feast days at any parish that has an organ and a decent organist.
Our parish has had fairly traditional pastors for the last 40+ years. That is not to say, however, that our music is all Latin. We use the St. Michael Hymnal, which includes many traditional hymns but also some newer songs too. We have organ music at three weekend Masses and guitar (but again, the same hymnal) at the fourth.
I have heard most of those hymns within the last year and I don’t regularly attend Mass in the Latin Rite. I attend the Divine Liturgy and occasionally attend Mass daily or on other special occasions. I don’t think they’re forgotten at all.
At my parish the choir sometimes sings Panis Angelicus and O Salutaris Hostia. They are more modern arrangements so you might not recognize the melody right away.
We do sing some of those other pieces on Holy Thursday while and just after the Blessed Sacrament is processed to the Altar of Repose.