Through the kindness of one of our readers who converted the PDFs of this music into JPGs I can now post this newly discovered 13th-Century Sequence version of the Stabat Mater for viewing by readers. The PDFs may still be downloaded here.
I am aware that these images are a bit blurry; if you click on them or download them, you will get a clearer image. I had hoped to have an audio file of this ready today, but this was not humanly possible. In any case, may God grant you all a blessed feastday.