First of all, I'm looking for the Gregorian Chant version of this song -- not any other melody or version.
I have the organ accompaniment for the "Parce Domine, parce populo tuo, ne in aeternum irascaris nobis." refrain.
By organ accompaniment, I mean "modern notation" rather than Gregorian chant (square note) notation. Some organists can play accompaniment right from the chant notation, but my 11 year old organist can't do that, at least not yet. It requires special training.
The song also has verses, and those verses have a beautiful melody. I'd like for the organist to be able to accompany that as well.
Can anyone help? Google was no help on this one.
Getting organ accompaniment for Traditional catholic hymns, especially the Gregorian chant, is really hit and miss.