by its nature, this was probably unaccompanied or even sung recto tono, although you could use organ later on IIRC.
I would take the antiphons Fidelis servus, Isti sunt sancti (for both mode 2 antiphons), Ista est speciosa (for both in mode 8; unfortunately, these four antiphons are the least similar to others in the mode), and then Angeli, Archangeli (but mode 7 antiphons like that are similar). That should give you all of the notes and most of the figures in the mode.
If not…two people who would accompany Vespers of the dead if asked would be Chris Berry at St Stanislaus in Milwaukee and Nick Botkins at the basilica of St John in Stamford, Connecticut. (I don't know that they do work for free, and wouldn't expect it, but they may have something noted in a Liber Usualis already.)
if you find something or come up with your own, please share it with us. It is actually, dare I say it, useful.
Oh shoot. I have the complete Potiron Vesperale but didn’t realize that he did the Off. defuctorum too. Thanks! (sigh, it's in another place on my machine)
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