Mondrian, Chances are that we have met. I was manager of the Cathedral retreat centre for a while. We entertained Dr Mary ? and her two dogs and two nurses. She is world famous in the world of Gregorian chant. Sadly, I can't remember the lady's surname.
Fr Byrne, the young priest who writes in the SCO, is also well into this particular musical art form.
Keep trying the Catholic Herald. It is not impossible (says one who couldn't complete the cryptic last week, and who made a mistake in the quick). For any that you are stuck with, if I can't help, Terry and Trevor, among others will surely know the answers.
Just back from a wonderful day of bus travel - Largs to Ayr, Ayr to Glasgow and Glasgow to Largs. All for no other reason than I like buses (and I travel for free).
Best wishes.
P