Last year I came across a version of some Gregorian chants (online), which had the English translations underneath the Latin texts. I believe it was from Solesmes (it had the ictus markings, etc), but I can't remember the name of the book.
Please do share the title, if you know what book this is!
I have a little red chant book called Chants of the Church: selected Gregorian Chants edited by the monks of Solesmes. It was published I believe, by the Gregorian Institute of America in 1953. The English translation is written in red ink underneath the Latin.
Very nice book if you want to follow the singing by looking at the English translation, especially it has the whole Requiem mass beside plenty of hymns. I presume this book is well known in USA? (Editor: Gregorian Institute of America). There must be a few here and there, all the eBay sellers locations are in USA.
Watershed has also been working on a book of the complete Graduale with English translations underneath each word for several years. This is mentioned here. But we are not even close to finishing, due in large part to our work on this.
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