This December, we are singing:

Messe de Minuit pour Noel by Marc-Antoine Charpentier

Festival of Carols by Frank Ferko

You can find many recordings of the Charpentier online, but here’s one that’s not scary fast: https://www.youtube.com/watch?v=crZ0IY0O3Ic

There are many online note learning tools for this too. One example is here: http://www.learnchoralmusic.co.uk/Charpentier/Messe%20de%20Minuit/minuit-messe.html

Fewer recordings of the Ferko set, but here are two movements: 

and a link for the whole work from the publisher: https://www.canticledistributing.com/audioplayer.php?n=6195.mp3