Gregorian chant is simple, but many are intimidated by it. And for choirs it presents the problem of singing acapella in tune. If you have a volunteer, non-auditioned chorus you end up with all sorts of voices (some can't carry a tune! They usually get buried by the organ) that don't lend themselves to unison chant singing.
Many are intimidated by the Latin, too.
Father, here's what I'd do. Ask your choir director to do the Latin mass parts for one mass every Sunday and/or for all masses during a special season, say Lent or Advent. Then expand their use from there. The Chant mass is included in the OCP yearly hymnals (not sure which one you use). But they are very simple. Most people might even recognize them. Also, write a little introduction in the church paper saying what masses you'll be using the latin mass parts.
Don't make a complete shift all at once. Maybe after you get them used to it a one mass, you can put it at two masses and so on. Soon...the evil Creation mass of Marty Haugen will be dead in Appleton! (BWAHAHAHAH...er...ahem.)
Now, you just had to squish two parishes together-did you have to move into one church building or are you still operating out of two? If two, do you have two choir directors and two choirs? Maybe you can start with one church then move to the other with the progression...
Anyway. Start with him doing only the Sanctus and Agnus Dei in Latin. Then add other small things. Then add the Gloria.
Do this at ONE mass a weekend, slowly expanding the inclusion of Latin until you got one full Novus Ordo done with latin responses.
Then expand to other masses.
Now what's great about this, is if you do just the sanctus, your music director can start finding other cool sanctuses for the choir to do in four parts--Sanctuses from the great masses of Gounod, Mozart, Vivalidi....Cherubini...etc. The sanctus can get reallllly holy there for a while. The choir director will love it.
Then suggest to him doing other cool parts in latin. He'll start finding all these great classical piece for the choir to do for the other parts. Can you imagine all the cool glorias he could find! Wow. People will start going to that mass just to hear the cool old classical music of the choir, and they'll come to EXPECT the latin. Slipping it in as responses after that point, should be truly easy...AFTER you get the main sections of the mass in place.
Pieces. Tiny pieces.
Oh yes, one more thing. Sell this one mass as the high mass with the choir. Maybe change the name of the choir to "schola" so they start to realize how COOL this mass is.
And, educate people on what the new parts are when you add them. Give them the lyrics in Latin and English on photocopied papers left the pews --maybe laminate the pages and leave them there, though that may cost more intitially.
Wow, I'm loaded with ideas on this. If you get it started, let me know. We've got to go visit hubby's parents in Appleton anyway soon...
Let me know what you think of that.
--Ann
PS: It also occurred to me if you start doing these mass parts in latin, especially if you ask the choir to do choral pieces for them, you'll have to expand the length of this mass in time and shift your mass schedule because the mass will take longer as a result.