Hello everyone, sorry for the rambling nature of this post, but I would really appreciate any suggestions:

The schola at my (EF) parish is going to start our fourth year of singing chant after our summer break in just a few weeks; one thing several of us in the schola have talked about for this upcoming year is trying to do more things "like organum" or possibly other medieval/early Renaissance stuff. To give you an idea of what we typically do: our men's schola does Gregorian propers and ordinaries, and more recently we've experimented by doing certain hymns (Audi Benigne Conditor and Veni Veni Emmanuel are the ones I remember) with parallel organum, as well as sometimes adding parallel organum to the amens/alleluias at the end of sequences. We also have a small mixed-voice choir that has sung some Josquin works (Ave Maria, Gaude Virgo), Byrd (Mass for 4 Voices, Ave Verum), and various other Renaissance composers. I was thinking of suggesting certain "organum-esque"/medieval/early Renaissance pieces for our groups to try, but the only piece I know that probably fits this description is the Dufay Ave Maris Stella. Does anyone have any other suggestions for our groups? These could be notated pieces, chants that work well with organum/drones, or anything else that sounds like it might fit the description, whether for just men's voices or mixed. Thanks!