Probably not within the reach of most parish choirs, but there are also, among the big names, James MacMillan and Arvo Part. (I know that MacMillan has written music for the parish choir he directs, but I'm not sure if any of this work has been published.)
Deal Hudson has been discussing contemporary religious composers on his radio show "Church and Culture" with musicologist Walter Simmons, who (among other things) is a repertoire consultant for Naxos and some other classical record labels.
Here are links to the programs they've done together highlighting various 20th-century composers. Some are not Catholic, but I include them for general interest.
Herein, Royce Nickel, Heath Morber, Francis Koerber, Jeffrey Ostrowski, Richard Rice, Richard Clark, Chuck Giffen, Patrick O' Shea and Jeffrey Quick. To a lesser known extent, myself (Ave Verum Corpus and Anima Christi.)
Due to the recent moving away of a couple of choir members, I have been writing quite a bit of SAMen music - "Ne-reminiscaris" / A Missa Brevis / a few collects etc. - although I had previously written a Requiem (soon to be recorded) & various SATB anthems including a Pater Noster (used on a few cathedral visits). They are mostly here - http://www.sheetmusicplus.com/search?Ntt=Attride - if of use. Most would certainly be achievable by a "parish choir".
Paul Jernberg. His harmonies are beautiful and quite accessible for adults and children. Ive taught his setting of St. Michael’s prayer to many school children, and our Parish sings the Mass of St. Philip Neri currently. There’s a long form and simple form of the Cherubic hymn that is wonderful. Ive been to a Mass with him conducting, and he has the choir sit front and center in the pews. I’ve started doing the same thing at my church with positive results.
Not to derail, but since you brought it up @Dr_Haze, what are the advantages and positive results? I’ve always found that if the singers can’t be vested and in the sanctuary, strongly integrated with the sacred actions in that way, the next best place really is in the choir loft if it exists.
For practical reasons, the average age of folks in my choir is above 60, the oldest being 94, several in their 80's, and making their way from our warm-up room to the loft stairs is time consuming and hazardous, but I'm not putting them in the pews for this reason.
When they sit in the front pews ahead of the assembly, their singing actually encourages more participation from the parishioners. And they are heard more clearly from the front than in the back up in the loft next to an overbearing Organ. We've started doing sung masses entirely acapella with part singing, and the harmonies are clearer and easier to hear. We're also able to give the choir an elevated role in a back and forth during responsorial psalm verses and the gospel acclamation verse. The cantor would start a verse and sing up until an asterisk* and the choir would finish the rest of the verse.
When I attended the premier of Jernberg's Mass for the Blessed Karl of Austria, and because the main melodic notation was made available in a program before mass, as I sat behind the choir in the pews, I was basically part of the group while sightsinging the mass parts.
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