That is nice, thanks @Andrew_Malton! And thanks to @monasteryliturgist for posting it. When I saw the original, it looked too difficult. But having downloaded the mxl and now listened to some YouTube recordings, it's lovely.
Singable intervals (steps, third, fifth), enough repetition to make it easy to pick up. The modern notation has sixteenth (semiquaver) decorations which are not in the picture posted where for example 'viscera' (16ths & 8ths) and 'marie'(8ths) use the same punctum inclinatum. So @tomjaw would you just not render anything less than an 8th? For my little group, I'd stick to the modern notation to keep the decorations.
I use a font based method to typeset chant, the default is a 4 line stave but could draw in an extra line. I don't know if it can be done in GABC as I have only set a few things that way. I have no experience with using modern notation, and no programme to set it in that notation.
At the moment my plan is to set all 7 verses to each of the two variant melodies.
To participate in the discussions on Catholic church music, sign in or register as a forum member, The forum is a project of the Church Music Association of America.