You can find both the chant and Vaughn Williams versions in The English Hymnal, circa 1936. You will also discover enough verses for a real Procession for each of the major feast - Easter, Ascension, and Pentecost - as well as another for the Dedication of a church. If you're looking for Latin, "Analecta Hymnica" has versions ranging fro 6 to 20+ verses for all the major Feast of both Jesus and Mary, and even some of the major Western saints. I have used the Vaughn Williams version a lot in the past. There is a version in "Songs of Praise" (from OUP, edited by RVW and Percy Dearmer) for regular Sundays. And I have authored a Doxology verse specifically for the musical verse with triplets.
'Salve Festa Dies' is also in the old Solesmes book "Processionale Monasticum" dating from 1893, but reprinted by Solesmes. This slim book has processional chants for most Sundays of the year and many major feasts. It's listed by Paraclete Press (I just looked).
Another useful book of chants (not propers) for use throughout the church year is "Cantus Selecti". (Unfortunately, it doesn't contain Salve Festa Dies).
If anyone still needs a source for this, it's on p. 237 of Laudes Festivae (1940; ~10MB pdf), and p. 1928 of Mass and Vespers (1957; ~112MB pdf), both available from this site.
@Lars ha- I didnt realize you were opening a new comment years later- I guess my versions are no good for you. Have you tried Fr. Samuel Weber? Even if he doesnt have it- he might do it for you for free- I have often asked him for help with such things and he does it in lightening speed.
This hymn and its various parodies do not have a constant line length, Any good translator should produce a better text in translation that could be metrical /strophic.
Hymns Ancient and Modern Revised (1950) has all of the processions covrved in the English Hymnal. Some might find these translations preferable to those in EH. The English Catholic Hymn Book (various publication dates, possibly most recently rev. in 1955), has a version for Corpus Christi. ECHB was produced for the Anglo-Papalists in the C of E who didn't find all they would have wished for in the EH.
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